Having read both comics and manga, there's a reason all my money's going to manga instead of comics. While some comics have lovely art (and some manga has sucky art) and some comics have good plot (and some manga has no plot), I'm sick of the utter misogyny of the comics industry as a whole. Manga's certainly not perfect (Bleach is the first manga ever that I've read that didn't involve at least one female character that made me want to rip my own eyes out) but I feel it's doing a better job. I've read some pretty well researched essays regarding how the comic industry's pretty much engineered its own downfall by continuing to ignore female readers, which is where manga got its huge boost.

It would be a really interesting topic for a paper, though...