[Tangram]

You can generalize the comics from any culture. Comics from the US tend to be more shallow, with less absolute continuity. They tend to either be superhero-focused, or the occasional slice-of-life (like Archie). There is less of a market for comics in the US, so you don't see a ton of variety. The art is more 'realistic', and it seems that US comic artists feel that it's a lot harder to draw in the US style.

Comics have a greater fanbase in Japan, so you're going to see a lot more variety there. There are a ton of genres in Japanese comics. They tend to follow a closed storyline and end with the main character having some sort of epiphany. The artwork is obviously different - more idealized. That's how art in Japan always has been.

The only other culture whose comics I'm familiar with is Korea. It seems that comics from Korea tend to be based on folktales or history. If-this-event-never-happened storylines seem to also be popular. The art here tends to have more details on people, but is similar to Japanese art. Again, this is how art in Korea has long been.

With anything that has several niches with noticeable differences, there will be rivalry. That can't be helped. It's rude, I think, for people to taut that one is better than the other. Obviously, both US and Japanese comics are good, because people buy them.