Demon Slayer, it's manga is good but not SUPER good, the animation really helped it get to a top tier anime.
Jujutsu Kaisen, the manga is already pretty damn good, but mappa elevated it further with their animation, plus the op is a banger.
Tower of God, the webtoon's art was still quite dogshit at the time, the new art style they did was quite good. also I'm still waiting for a second season...
Mob Psycho 100, super good.