There might be extra features like prompt library/templates, text to speech, etc. Also, ways to send long chat history to the API without exceeding the context limit.

So what's you favorite? Free or paid.

For me, I found Chatbox [1] to be good for now. I tried ChatGPT Next Web [2] which seems to have advanced features but I couldn't learn how they work because most of the documentation is in Chinese. I tried Lore [3] a while ago and it seemed to have a great UX but when I wanted to try it again, I found that my trial was over and couldn't try it more nor know if it's still being updated.

[1] https://github.com/Bin-Huang/chatbox

[2] https://github.com/Yidadaa/ChatGPT-Next-Web/

[3] https://thellm.app/