Respectfully, MHA was a better series holistically.
Jjk doesn't have anything with the same emotional weight as that final almighty fight or almighty's brief return or even those scenes when everyone comes together to give their everything to fight one bad guy while mutilating themselves.
Jjk was only good for it's Unique powers and first soyndtrack, but other than that , it's extremely lacking. The characters are more or less one dimensional and there aren't any real stakes in the series.
Chainsawman is a much better executed version of Jjk. It has high stakes, dynamic characters, unique powers, and extreme emotional weight in many episodes.