Miura, Inoue and Hara are the best choices imo.
Berserk had top notch art, fights, story-telling and character development.
Vagabond is a masterpiece, and I've heard good things about Slam Dunk too.
Hara has been dropping nothing but fire for almost 700 chapters since 2006, Kingdom's art quality is absolutely insane for a weekly manga.
Araki also has been drawing Jojo since the eighties, and his fights are among the most creative in manga.
Pre Time Skip Oda is one of the better shonen mangakas, but Post Time Skip Oda doesn't deserve half that many votes lol.