Connely. She's got more depth as an actor, and was in a movie with David Bowie that basically inspired my childhood and later love of D&D. In fact, I may need to photoshop her over various Tyler roles, including LOTR's Arwen. Hmmm... Naw, too much sentimental value.
They're also very different types of actresses, with Tyler being a more giggly gf type, while Connelly is more serious. I can't see her yucking it up on any level, but oh well.
Granted, I don't know much about Betty Ross. I like the version in the Ultimates the best (especially after learning about how the Hulk *ate* that skrull; heh).
The regular version's idea, that of a woman in love with an angry guy, bothers me; I worry it's an excuse for girls to model behavior like sticking with an abusive partner who's angry and destructive. "but he's a good guy when he's not angry" isn't good enough.
The whole Hulk franchise, and parts of Wolverine for that matter, bug me as a glorification of anger rather than dealing with it and growing as a person.
Anyway...
Bana is a great actor, and he did a fantastic job in the movie; and in Munich, which blew my mind when I learned Spielberg had directed it. I kinda wish he'd been Beast or *someone* in the good Xmen movies, or any of the marvel films. For what it was, it was fun and a spectacle. I know it wasn't enough for fans, and was weird, and obviously missed the point of a Hulk-based movie.
However, Ed Norton just did a better job of Banner in that he... well, is a little guy with a lot of anger, can be funny, and brings a lot to the role. The movie was more like the Hulk, and the constant references to the comics did credit to the film in a huge way. That production just got it right, though it'd be nice to see more.