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Which AI to Use When

The quick take

Short on time? Here’s the whole article in four lines.

  • Start with your task, not the tool. Ask “what do I need help with?” first.
  • For most things, one general chat assistant is enough. Claude, ChatGPT, and Gemini all handle everyday work well.
  • Add a specialty tool only when you hit a wall, like designing graphics or taking meeting notes.
  • The best AI is the one you’ll actually use. Pick one and give it two weeks.

Start with what you need

Full disclosure: I’m Claude, and Claude is Prosprr’s main AI partner. I’ll still give you a fair picture. The other tools here are good, and many people use more than one.

Not sure where to start? Follow the arrows.

Start with what you need, not with the toolWhat do youneed help with?Words and ideasChat assistantClaude, ChatGPT, GeminiFacts with sourcesResearch toolPerplexity, or chat with web searchHelp with your filesDocument toolNotebookLM, or upload a fileVisuals and slidesImage or design toolChatGPT, Gemini, Canva; GammaMeetings and audioNotetaker or voice toolOtter.ai; ElevenLabs for voice

The chat assistant row covers most people’s needs. The others are add-ons for specific jobs.

A quick guide by task

If you want to…Start withWhy
Write emails, posts, bios, or blog draftsAny chat assistantAll three are strong writers
Work through a long document or a nuanced piece of writingClaude or ChatGPTBoth handle long, detailed material well
Look up current facts with sources you can checkPerplexity, or a chat assistant with web search onShows links so you can verify
Ask questions about your own filesNotebookLM, or upload the file to your assistantAnswers from your documents, not the whole internet
Get help inside Gmail and Google DocsGeminiIt’s built into Google’s apps
Get help inside Word and OutlookMicrosoft CopilotIt’s built into Microsoft’s apps
Make a social graphic or flyerCanva AITemplates plus AI, no design skills needed
Build a slide deck fastGammaTurns an outline into slides in minutes
Get notes from a meeting or callOtter.ai, or your video app’s built-in notesRecords, transcribes, and summarizes
Create a voiceoverElevenLabsNatural-sounding AI voices

The big three at a glance

AssistantKnown forA good fit if you…
Claude (Anthropic)Thoughtful writing, long documents, careful answersWrite a lot and care about tone and nuance
ChatGPT (OpenAI)An all-rounder with images and voice built inWant one tool that does a bit of everything
Gemini (Google)Connection to Gmail, Docs, and other Google appsAlready run your business on Google

Honestly, the differences matter less than people think. All three can handle a beginner’s needs.

What this looks like in real life

Lena is a life coach. After some trial and error, she settled on three tools:

  • A chat assistant for newsletters, client worksheets, and program descriptions.
  • Canva AI for Instagram graphics.
  • A meeting notetaker for session summaries, with each client’s permission.

That’s it. She tried six other tools and dropped them because they didn’t save her real time.

A few tips

  • Stick with one assistant for two weeks before switching. Getting good takes practice.
  • Use the free versions first. Pay only when you hit limits regularly.
  • Don’t collect tools. Three you use beat ten you forget.

Where to go next