For me, it's Naoya "Monster" Inoue. He's a ring assassin that looks for the KO and executes his opponents in a brutal and violent yet cerebral and skillful manner. Runner Up: David Benevidez
I would say lomanchenko, he can arise from "watching paint dry" to top notch offensive bully in the span of minutes.
Vasquez?? As for me now, maybe the same as the OP for Naoya Inoue. They don't call him a monster for nothing!
In the ring: Kovalev. He used to be the most exciting because of the KO's, now he's been getting KO'd every other fight, so that doubles the drama. Fight build-up/pressers/ring walks: Fury. Best conspiracies/memes: Wilder. Best BBBC suspensions: Saunders.