>>726047373
Isle 4 has the best looking boss fights but it's all just projectile overload. Mortimer Freeze is the only actual cool boss in the DLC. It's honestly tough to call any Isle the best, since they all have annoying plane levels, but maybe Isle 2? Beppi and matchstick are very rewarding to get good at

>>726047373
Based on S ranking, for me it's
Isle 1 > Isle 4 > Isle 3 > Isle 2

Isle 1 just has the most consistently fun bosses for me. Yeah they're all designed to be easy but I enjoy fighting all of them.

Isle 4 is pretty solid, I really like the parry minibosses, and the only boss I don't like is the Giant. Baker fight is always fun to S rank and is a great final boss.

Isle 3 is mostly fun and has some of my favorite fights in the game (Train, Mouse) but I find the run n gun levels kinda forgettable, the Pirate boss is way too simple (Mouse is too but I find that one more charming), not a fan of the Bee fight, and the Devil is too easy.

Isle 2 I don't really like and find its run n gun levels and bosses to be more boring but I can't really explain why. I like the Candy and Dragon bosses the most but that's it really.