Ultimate Spider-Man is probably my favorite comic book run of all time but I've never really read much of the rest of the universe. I've heard the Ultimate X-Men books are pretty good although I know the quality drops off a cliff at some point. Is at Ultimatum where it tanks or does quality decline before that?
I'm honestly open to different interpretations of these characters as long as the stories are good. I'm not too familiar with the Ultimate X-Men characters with the exception of Kitty and Logan who appeared in Spider-Man, Kitty being a support character for a while. I enjoyed both a lot since it seemed like they managed to properly re-tell the young student story with Kitty and Ultimate Wolverine being significantly more sociopathic than his 616 version was pretty funny.