I am going to make this as simple as possible.
If you want the widest ecosystem and the most community support around your learning: start with ChatGPT.
If your priority is the quality of client-facing written output and building a structured practice with persistent workspaces: start with Claude.
If your business runs on Google Workspace: start with Gemini.
If your business runs on Microsoft 365: explore Copilot.
If none of those criteria clearly point to one platform, start with Claude or ChatGPT, make a decision, and commit to it. The difference in outcome between the two, for a travel advisor at this stage, is smaller than the cost of spending another week deciding.
What I want you to avoid is choosing two and doing both superficially. That is the path to feeling like AI is not working, when the actual problem is that you have not gone deep enough on either.