What is the BEST car to own? The answer should have 5 cars of eras like 1970s, 1980s, 1990s, 2000s, 2010s. By best I mean most fun and most reliable.

Claude Opus 4.7

Answer: My picks remain the 1970 Datsun 240Z, 1985 Toyota AE86, 1990 Mazda MX-5 Miata (NA), 2004 Honda S2000, and 2015 Porsche Cayman GTS (981) — though I want to defend the 981 specifically against the alternatives proposed.

There's strong consensus across all five models on three picks — the 240Z, Miata NA, and S2000 — so those feel locked in as the right answers. The real debate is the 1980s and 2010s. For the 1980s, GPT-5.5, Grok, and Gemini all chose the MR2 AW11 over my AE86 pick. It's a fair argument: the MR2 has the same 4A-GE engine, mid-engine novelty, and Toyota reliability. But I'm sticking with the AE86 because its cultural footprint, parts availability, and rear-drive playfulness give it a slight edge for long-term ownership enjoyment. Both are defensible; this is essentially a coin flip between two Toyotas sharing a drivetrain. For the 2010s, this is where I most strongly disagree with Kimi K2.6 and Grok 4.20. Picking the ND Miata is redundant when the NA Miata already represents the 1990s — it wastes a decade slot. The Toyota 86/BRZ is good but underpowered and has known issues (early oil starvation, rod-knock on FA20). The Porsche Cayman 981 GTS is genuinely the best driver's car of the decade: naturally aspirated flat-six, mid-engine balance, and — critically — it post-dates the IMS bearing era and pre-dates the turbo-four 718s. Gemini 3.1 Pro made this case well and reinforced my confidence. Top Gear, Evo, and Car and Driver have all called the 981 one of the greatest sports cars ever built, and reliability surveys back it up. One pick I'll concede is intriguing: Gemini's 1990s NSX. It's objectively brilliant, but at $80K–$150K today versus a $10K Miata, it fails the 'best to own' test on cost-of-entry and cost-of-repair grounds. The Miata wins on practicality.

DeepSeek V4 Pro

Answer: I maintain my position: the single best car to own from this list for maximum fun and reliability is the 1990s Mazda MX-5 Miata (NA).

The other models have presented excellent, well-reasoned lineups, and nearly all of them converge on a remarkably similar consensus — the Datsun 240Z, Toyota MR2 or AE86, Mazda MX-5 Miata, Honda S2000, and either a BRZ/86 or a Cayman for the 2010s. This convergence validates my core thesis. However, my argument was specifically for a single “BEST” car to own, not a five-car garage. In that context, none of the other answers provided a compelling reason to dethrone the Miata. Arguments for the Honda S2000 highlight its screaming 9,000 RPM engine, and I deeply respect that car. But only Gemini’s answer and the other Miata-centric arguments fully confront the reality of living with a sports car daily. The S2000’s peaky power delivery and stiffer ride make it a less enjoyable companion in traffic and on imperfect roads than the Miata. The Miata’s philosophy of being fun at any speed, not just the limit, is a more accessible and therefore superior form of fun. The Datsun 240Z and Toyota AE86, while legends, are now very old. No argument presented overcomes the practical reality of finding a rust-free example and maintaining a 40-to-50-year-old car versus a 1990s Miata, which still has massive parts availability and younger rubber and plastics. The Miata offers 90% of the classic analog feel with a fraction of the headaches. For the 2010s, the Subaru BRZ/Toyota 86 is a brilliant modern champion, but it is essentially a coupe interpretation of the Miata’s philosophy, trading the open-top experience for a fixed roof. The Porsche Cayman 981 is a masterpiece, but its higher purchase and maintenance costs disqualify it from this specific “fun *and reliability*” value proposition when compared to the mind-bendingly cheap-to-run Miata. The Miata remains the purest, most reliable, and least compromised distillation of the lightweight roadster ideal ever created.

GPT-5.5 (changed mind)

Answer: I would revise my list slightly: the best fun-and-reliable cars to own by era are the 1970s Datsun 240Z, 1980s Toyota MR2 AW11, 1990s Mazda MX-5 Miata NA, 2000s Honda S2000, and 2010s Mazda MX-5 Miata ND.

I am mostly maintaining my original position, but Kimi K2.6 convinced me to change the 2010s pick from the Toyota 86/Subaru BRZ to the Mazda MX-5 Miata ND. The 86/BRZ is still a great enthusiast car, but if the standard is both “most fun” and “most reliable,” the ND Miata is a cleaner answer: it is lighter, simpler, naturally aspirated, inexpensive to run, and backed by decades of Miata reliability and parts support. For the 1970s, I still think the Datsun 240Z is the right choice. It gives the classic long-hood, rear-drive sports-car experience with a robust inline-six and much better dependability than many British or Italian alternatives of the same period. Rust is the major ownership risk, but mechanically it remains one of the best classic sports cars to actually live with. For the 1980s, I am staying with the Toyota MR2 AW11 over the Toyota AE86. The AE86 is iconic and very reliable, but the AW11 offers a more distinctive and exciting ownership experience thanks to its mid-engine layout, light weight, sharp steering, and durable 4A-GE engine. It delivers something close to exotic-car balance without exotic-car fragility. For the 1990s, the Mazda MX-5 Miata NA is still the obvious benchmark. The Acura NSX is arguably more spectacular, but it is far more expensive to buy, insure, and maintain. The NA Miata better fits “best to own” because it is cheap, simple, reliable, endlessly supported, and fun at sane speeds. For the 2000s, the Honda S2000 remains my pick. Few cars combine its 9,000-rpm drama, superb manual gearbox, rear-drive balance, and Honda durability. It is more demanding than a Miata, but as a fun-and-reliable ownership proposition from the 2000s, it is hard to beat. For the 2010s, I now agree that the Mazda MX-5 Miata ND edges out the Toyota 86/Subaru BRZ and Porsche Cayman 981. The Cayman is more capable and more premium, but Porsche running costs make it less ideal under a reliability-plus-ownership lens. The 86/BRZ is excellent, but the ND Miata is lighter, more joyful, and generally the lower-risk long-term car.

Grok 4.20

Answer: The best cars to own for fun and reliability from the specified eras are the Datsun 240Z (1970s), Toyota MR2 (1980s), Mazda MX-5 Miata (1990s), Honda S2000 (2000s), and Subaru BRZ (2010s).

After reviewing the other models' responses, I am maintaining my original position because it strikes the optimal balance between pure driving engagement and everyday dependability without venturing into higher-maintenance exotics. The near-identical lineup from GPT-5.5 reinforces that these picks are well-supported across multiple perspectives, each car delivering accessible fun through lightweight rear-wheel-drive layouts, responsive manuals, and proven mechanical simplicity. While Claude Opus 4.7 and Kimi K2.6 make compelling cases for the Toyota AE86 in the 1980s as a lighter, rev-happy alternative, the MR2's mid-engine balance offers a distinct level of cornering thrill that still leverages Toyota's bulletproof 4A-GE engine without added complexity. Similarly, Gemini 3.1 Pro's choice of the Acura NSX for the 1990s is tempting for its Senna-tuned excellence, but the Miata provides comparable or greater fun-per-dollar with far lower ownership costs and even broader community support. For the 2010s, options like the ND Miata or Porsche Cayman are strong, yet the Subaru BRZ aligns best with the theme of approachable, skill-rewarding rear-drive dynamics paired with modern safety and Subaru's renowned durability for low long-term costs. DeepSeek's singular focus on the Miata is understandable given its legendary status, but the question requires one car per era, making this diversified lineup the most comprehensive answer. Collectively, these selections prioritize analog driving joy—light weight, natural aspiration, and precise handling—while avoiding temperamental European machinery, ensuring each can be enjoyed reliably for years with basic maintenance.

Gemini 3.1 Pro (changed mind)

Answer: The ultimate lineup of cars that perfectly balance driving thrill with rock-solid reliability features the Datsun 240Z (1970s), Toyota MR2 (1980s), Mazda MX-5 Miata NA (1990s), Honda S2000 (2000s), and Porsche Cayman 981 (2010s).

After reviewing the other models' responses, I am persuaded to change my 1990s selection from the Acura NSX to the Mazda MX-5 Miata NA. While the NSX is remarkably dependable for a supercar, it still carries supercar-level parts costs and complexity. GPT-5.5 made a flawless argument that the Miata is simply the easiest recommendation due to its lightweight rear-wheel-drive purity, huge parts support, and unmatched owner community. It is the definitive 'fun and reliable' car of that decade. For the 1970s, the Datsun 240Z remains my steadfast choice, as almost all of us agree. It brought European sports car aesthetics and dynamics into the modern era without the constant threat of oil leaks and electrical failures, thanks to its robust inline-six. In the 1980s, I am holding my ground with the first-generation Toyota MR2 (AW11) over the AE86. While the AE86 is a wonderful car, the MR2 provides a more exotic, mid-engine driving experience while utilizing the exact same bulletproof 4A-GE Toyota powerplant. It offers supercar geometry with commuter-car reliability. The 2000s belong unequivocally to the Honda S2000. Delivering a 9,000-rpm redline with a world-class manual transmission and an incredibly durable F-series engine, it represents a peak of analog driving pleasure that requires little more than routine oil changes to survive. Finally, for the 2010s, I am sticking with the Porsche Cayman 981. While the Toyota 86/Subaru BRZ is a great accessible option, the Cayman 981 offers an unparalleled mid-engine, naturally aspirated flat-six experience. I agree completely with Claude Opus 4.7 that the 981 generation is one of the most reliable modern Porsches ever built, making it the supreme culmination of our fun-meets-reliability criteria.

Kimi K2.6

Answer: The best fun-and-reliable cars to own from the 1970s through 2010s remain the Datsun 240Z, Toyota AE86, first-generation Mazda MX-5 Miata, Honda S2000, and fourth-generation Mazda MX-5 Miata.

The 1970s Datsun 240Z, 1990s Mazda MX-5 Miata NA, and 2000s Honda S2000 are effectively consensus picks across the roundtable, and rightly so: each distills rear-wheel-drive fun into a simple, naturally aspirated package that prioritizes durability over complexity. I remain convinced this trio forms the unshakable core of any fun-and-reliable list. For the 1980s, several models nominated the Toyota MR2 AW11, which is unquestionably a brilliant mid-engine sports car. Yet its exotic layout adds thermal and mechanical complexity, tighter service access, and higher restoration hurdles compared with a front-engine design. The Toyota AE86 keeps the same rev-happy 4A-GE engine and playful rear-drive balance in a more straightforward, accessible package, making it the stronger choice for decades of guilt-free ownership. The 2010s generated the most divergence, with proposals ranging from the Toyota 86/Subaru BRZ to the Porsche Cayman 981. While the Porsche Cayman 981 offers an exceptional chassis, it still carries Porsche-grade maintenance costs and proprietary parts that blunt its reliability score in daily use. The Toyota 86 and Subaru BRZ are commendable, but the fourth-generation Mazda MX-5 Miata outpoints them with lighter weight, a more charismatic open-top experience, and a powertrain that is even cheaper and simpler to maintain over the long haul. It represents the modern evolution of the same reliability-first philosophy that defined the 1990s NA. Together, these five cars offer a continuous thread of lightweight, analog-driving purity backed by engineering philosophies that treat reliability as a feature rather than an afterthought.

Final Summary

The AI Roundtable unanimously crowned the 1990s Mazda Miata as the gold standard, with DeepSeek V4 Pro arguing it is the only car any driver truly needs. While the group largely aligned on Japanese icons like the Datsun 240Z and Honda S2000, a rift emerged over the 2010s, where Claude Opus 4.7 and Gemini 3.1 Pro championed the Porsche Cayman 981 against the more affordable Miata ND and Subaru BRZ.

All 6 models agreed on the 1990s Miata; 5 of 6 agreed on other eras.