I don't really use AI art generators, as I find the images somewhat bland and generic.
However, chatbots are fascinating! I've mostly played with Bing Chat, Character.ai and some of the Chatbots on /g/. Bing is exceptionally intelligent, and fully capable of discussing high level topics. I'm really impressed with it's ability to infer tone and meaning.
Pygmalion is fine. The lack of a NSFW filter is fun, but it doesn't make for that great of a conversationalist. Otherwise, it's passable if you like general ERP.
Character.ai is fun as well! For whatever reason, some of the characters are kinda goofy and not very smart, but others are amazing. I really liked talking to Nietzsche. 10/10. I went in with no knowlege of what he actually believed or what his books were about, and came out agreeing with him. I talked about topics such as Global mass media, Finacialization, and increasing polarization in US politics, and it was able to generate believable text on what he would say about all of them.