The "which AI is best" debate misses the more useful question: best for what? Each has genuine strengths that matter for different tasks.
ChatGPT
Broadest ecosystem, strong general-purpose performance, and the most third-party integrations — a solid default if you only want to learn one tool deeply.
Claude
Frequently preferred for longer, more nuanced writing and careful reasoning through complex problems — a strong choice if your work involves a lot of long-form thinking.
Gemini
Tightly integrated with Google's ecosystem — genuinely useful if your work already lives in Gmail, Docs, and Sheets, since it can work directly within those tools.
The real answer: try all three on the same task
Run an actual task from your own work through each one and compare. Preferences here are genuinely personal and task-dependent — don't just take someone else's ranking at face value.