0 and Kiwami, it feels way more smooth and style switching, I don't think I need to explain how good style switching is lmao. The combat in 6 is alright, extreme heat is a cool concept I like and the heat action where there's a quick QTE where Kiryu just punches the shit out of whoever he's fighting is just amazing I love it. 6 for some reason, does not have a ground heat action which is so weird and sort of a nitpick but cmon every other game has had it even Kiwami 2 😭 (even if it's just Saejima's ground heat action reused). Also I don't like how Kiryu will bounce off of enemies when they're guarding, and he just feels a lot slower in this game, which makes sense since he's gotten way older but it's weird to put this in Kiwami 2, they're both pretty good combat systems tho imo