I used to read a lot, but here are the ones that immediately stick out on top of my head.
Cardcaptor Sakura/Code Geass by CLAMP: it's so easy to tell it's CLAMP simply cause of the stick-like characters.
Hikaru no Go/Death Note by Takeshi Obata: a classic for me
Solo Leveling by Dubu (Redice Studio): top tier paneling
Castlevania by Ayami Kojima: Not a manga, but damn! It probably takes a long time for her to draw them, but can you imagine the art style as a manga?
The Way to Confess by Kimpa/Kira (I'm not sure which one is the artist): top tier coloring, it's gorgeous. There are a lot of really good Korean artists, but this is my favorite.
Jiang Ye by Keng (I think): A lot of Chinese webtoon looks really nice, and they use a lot of photoshop techniques, but I really like how it's done in Jiang Ye. The coloring is really nice.