The Best COOP game?

If you are on pc I can give u a pretty good list I can't pick a fav lol. (these are on steam btw)

Lego games, lethal league, relic hunters zero (free), gang beasts, cuphead, cloudberry kingdom, bloody trapland, battleblock theater, Trials, Zombie estate 2, serious sam games, and Castle crashers

These are a blast wif friends.