I'm not talking about the best, or the most realistic or nicest looking but the most interesting, unique and recognisable style. Interested to hear about some artists I may not have heard about.
I immediately thought about ONE, his artstyle broke my view of manga artist. It’s unique because well... it’s far from realistic or classic manga style. However his art style hold that special thing which makes it so cool. It’s deliberately « « ugly » » for comic relief purpose in OPM but in mb100 there’s something really captivating about how he draws character’s expressions. I just love that.
Boichi's art style comes to mind when it comes to unique and recognizable.

Yup i love boichi, he even has youtube channel he does q&as and stuff if you're interested: https://www.youtube.com/channel/UCXX6Rv-0il3cSNYTh40IgPQ
Hirohiko Araki
JoJo no Kimyou na Bouken Phantom Blood