I'm using Codeium and it's good. I only tried one other one which didn't turn out to be as free as you'd think (I don't remember the name, probably for the better)

Especially for the free ones, just install one and try it for a day or two

Why don't you try them and figure out which is best? Someone'll have to do it...

Cody Pro is free till February. You can try it and be your own judge.