If you've only got time to pick one assistant, the honest answer is: it depends on what you're doing most often. Here's a plain breakdown of where each one tends to pull ahead.
ChatGPT — the generalist
ChatGPT is the one most people have already tried, and for good reason — it's a strong all-rounder for brainstorming, drafting, and quick research. It also has the widest plugin and image-generation ecosystem (DALL·E 3 is built right in), so if you want one app that does a bit of everything, this is usually the safest starting point.
Claude — the careful writer
Claude tends to stand out on longer, more careful writing and on working through big documents — contracts, reports, long PDFs — without losing track of the details. If your day-to-day involves editing, summarizing, or reasoning through something dense, it's worth having in the rotation alongside ChatGPT.
Gemini — the one already in your Google tab
Gemini's biggest advantage isn't necessarily raw capability — it's that it's already sitting inside Gmail, Docs, and Search. If most of your work already happens in Google's apps, Gemini removes a lot of the copy-paste friction the other two still require.
You don't have to pick just one
Most free tiers are generous enough that trying two assistants for a week costs nothing but a bit of tab-switching. The fastest way to find out which one fits your workflow is to run the same real task — a draft email, a summary, a piece of code — through each and see which output you'd actually ship without editing.
All three, along with the rest of the tools we track, are listed on the AI Stackroom catalog.