Super Smash Brothers Ultimate, despite having “all the characters from previous games + more,” doesn’t have a bunch of characters I like playing as. I’ve finally managed to find a good amount of characters that I’m decent with, but that’s after around a year or more of playing the game. What I mean by this is that I prefer how things were in Melee, Brawl, and Smash 4. How the characters worked (which moves they had and stuff), how fights worked, and everything. I do like Ultimate as a game... just not some of the characters and some other things.
For that reason, My Hero One’s Justice 1 + 2 > Smash Ultimate as far as fighting games go imo.