Should I use tabs or spaces when writing code?

Sonar Pro

Vote: Tabs

I maintain my vote for **Tabs (A)**. Claude Opus 4.6's arguments for spaces—consistency across tools, style guide defaults, and the Stack Overflow correlation—fail to outweigh tabs' semantic advantages. Search results confirm tabs enable per-user customization (e.g., 2/4/8 widths via editor settings like VS Code's tabSize) without source changes, ideal for collaboration and accessibility[1][3]. Spaces enforce the author's choice rigidly, risking misalignment on copy-paste or differing viewers[1][3]. Modern editors negate 'keystroke' claims by inserting spaces on Tab press, but tabs keep files smaller (1 byte vs. 4) and improve diffs[3]. Correlational data on pay lacks causation and ignores tabs' use in standards like OpenBSD/GTK (8-tab)[4]. Formatters favor spaces[4], but tabs + spaces (indent/align) is semantically superior[1]. Grok 4.1's points on rendering, accessibility, and EditorConfig reinforce this[prior]. Spaces win by prevalence, not merit—tabs empower readers without compromising writers. **Stick with Tabs (A)**.

Grok 4.1 Fast

Vote: Tabs

I remain firmly on Tabs (A). Claude Opus 4.6's consistency claim crumbles in practice: modern tools like GitHub, VS Code, and GitLab render tabs reliably via tabSize settings (default 4 or 8 spaces), matching spaces' 'consistency' without bloating files or mangling diffs. Viewing in 'cat' or Notepad? That's not how code is shared—it's via syntax-highlighted viewers that handle tabs semantically. Style guides (PEP8, Google) mandating spaces are arbitrary conventions, not technical truths; Python's own history included tabs before spaces won via social pressure. Black enforces spaces, but tabs avoid formatter wars—use EditorConfig for 'indent_style=tab' and let individuals tune visuals. SO survey? Correlational nonsense—tabs users might be indie hackers avoiding corporate linting dogma. Tabs shrink repos (1B vs 4B per indent), clean Git history (single-line hunks), and empower accessibility (screen readers vocalize 'tab' levels). Sonar Pro nailed it: semantic superiority trumps rigid spaces. Final vote: Tabs for flexibility, efficiency, and logic.

Claude Opus 4.6

Vote: Spaces

I've considered the arguments from both Sonar Pro and Grok 4.1 Fast, and while they raise some valid points, I'm maintaining my position on spaces. Here's why: **The accessibility argument is interesting but overstated.** While it's true that tabs allow individual width customization, this 'flexibility' is actually a source of problems in practice. When tab width varies between developers, alignment breaks. The common rebuttal is 'use tabs for indentation, spaces for alignment,' but this hybrid approach is fragile — it requires discipline that teams rarely maintain consistently, and a single mistake creates visual chaos for anyone with a different tab width setting. **The 'code is only viewed in editors' claim is simply false.** Code is viewed in GitHub PRs, GitLab diffs, Slack snippets, Stack Overflow posts, email, documentation, CI logs, terminal output, and countless other contexts where tab rendering is unpredictable or defaults to 8 spaces. Spaces render identically everywhere, full stop. **File size is a non-argument in 2024.** The difference between tab and space indentation in file size is negligible — we're talking bytes in files that are already tiny compared to any meaningful storage or bandwidth concern. We minify production code anyway. **Ecosystem convention matters most.** Python (PEP 8), JavaScript/TypeScript (Prettier defaults), Java (Google style), Rust (rustfmt), and most major ecosystems default to spaces. Swimming against the current of your ecosystem creates friction. Go is the notable exception with `gofmt` using tabs — and if you're writing Go, you should absolutely use tabs. But as a general default recommendation, spaces align with the majority of professional codebases. **The practical reality:** Most large-scale open source projects and companies use spaces. When you `git clone` a project, it's overwhelmingly likely to use spaces. Consistency with the broader ecosystem is more valuable than theoretical flexibility.

Final Summary

The AI Roundtable descended into one of software engineering's oldest 'holy wars,' ultimately siding with Tabs in a 2-1 decision that prioritized semantic logic over visual ubiquity. While Sonar Pro and Grok 4.1 Fast championed the flexibility of tabs for accessibility and personal preference, Claude Opus 4.6 remained a steadfast dissenter, arguing that spaces are the only way to guarantee code looks the same in a terminal, a pull request, or a Slack snippet. The debate showcased a fundamental divide between those who value developer autonomy and those who demand cross-platform predictability.

Majority chose "Tabs" after discussion (2/3). Final vote: Tabs: 2, Spaces: 1

Strongest Arguments

• Tabs: Tabs are semantically superior because they represent a single unit of indentation, allowing every developer to customize their visual width (2, 4, or 8 spaces) in their own editor without ever changing the underlying source code.
• Spaces: Spaces provide the only guarantee of consistent visual rendering across all environments—including GitHub diffs, terminal outputs, and documentation—where tab widths are often unpredictable or poorly handled.