Meh, I guess I can say I like both, though I haven't seen/read many. My favorite romance manga was Ai Yori Aoshi which I thought the last couple volumes were really sweet and intense, sort of scary too *thump thump.* Plus it is the most excellently drawn manga I have ever seen (I've seen art of more than the 2 I've read) My favorite romance anime would not be the anime verson of AYA (Because it is cut way short with lots of fillers, doesn't approach the story near the end of the manga which brings closure to the series) but would probably beeeee Chobits, since I never read the manga and it is the only other anime classified as romance I've seen. Sure, a lot of other stuff has some romantic moments or relationships, but that isn't genre romance.
If I want romance, I'd rather read novels, because they can flesh out the relationships without you paying $100s for a love story. XD
Though, When I get a 6 figure... *cough hope* job, I'll have money for the pleasure of just devouring manga.