The Japanese manga industry is in dire need of reform and/or revolution, particularly on the working conditions of mangakas and all the involving staffs. However, content and culture are things that I see no webtoons capable of eclipsing Japanese manga (happy to be corrected; the only webtoon I've seriously followed is Peerless Dad).

The manga spectrum is incredibly diverse. Jam-packed action sequences (Sakamoto Days, The Fable), rich and vividly crafted worldbuilding (One Piece, Otoyomegatari, Houseki no Kuni), mesmerizing artwork and paneling (Witch Hat Atelier, The Summer Hikaru Died, Black Paradox), and, above all, poignant narrative and unforgettable characters, where the stories vacillate between the historical, from the quest for gold of two impoverished Irishes (Katabami to Ougon) to the burgeoning of heliocentrism in medieval Europe (Chi: About the Movement of the Earth), the ordinary, like seeing the ghost of Jimi Hendrix (Shiori Experience), and the illusive, including the world of minerals and souls (Houseki no Kuni) or the world inbetween (Alice in Borderland), manga has everything to offer.