ChatGPT is the one I definitely have the most experience with. I actually paid for a membership awhile back so that I could get access to the latest versions as they release, but there's not a lot that I use it for that the older, free models can't do. For example, now it can make linguistic sense of the images you feed it, but I haven't messed around with it much yet or discovered any real applications for that ability yet.

I've only briefly messed around with a couple of the competitors. Even Snapchat has its own AI now. I've heard people say there are better AI tools available than the ones I've tried so far, but it's been such a fast-evolving world and I've been satisfied enough with what I've gotten from ChatGPT that I haven't really felt the need to explore too much beyond it. Hope that helps!