This is an easy answer. But you know what? Maybe people will disagree with me, but it's mostly because of the art, rather than actual designs. I would say Baki has good designs. Not the best, but really good. And it's comparable to Solo Leveling, in a sense that Baki does not have over the top designs, nor will you find million of unnecessary details. Character designs in Baki are very simple, and they are a lot better than in Solo Leveling. They are stylish, some characters can tell who they are with their looks alone, and so on.