For me, my primary tool is now ChatGPT. I love that I can do everything I need in one place. Create Skills, Plug-Ins, Apps, Sites, Agents, Images (really good ones), and now Spaces, and Dots (their newest always-on agent that's rolling out). I can do everything in ChatGPT and Codex (their coding platform that you have access to ... similar to Claude Code). I do also still have my Claude plan because I I had moved to Claude 6 months ago and still have some agents and scheduled tasks over there and I am teaching on both platforms. Gemini Notebook is definitely my 3rd most used tool... so if you could only choose 2... I would recommend ChatGPT and Gemini Notebook.