I used the free version of Tabnine and beta tested Copilot.

I actually really liked Tabnine but sometimes the tons of suggestions got annoying. I upgraded my IDE and forgot to add copilot but didn't feel like I needed to. Maybe that's a mistake... but sometimes it felt like it was getting in the way and I did encounter a few times it would create "bugs" which I would have to spend time going back and fixing.

Not trying to knock these though. They're both very impressive tools.