It depends on what you mean by "better". As better is a very subjective term. Better in terms of sales? Probably Wolverine or Spider Man, due to their popularity. But I picked Captain America: The Winter Soldier, because 1) I'm a Cap fan and I'm looking forward to it more than the other movies. and 2) The movie is, basically, an adaptation of Brubaker's comic arc, of the same title.
Best CBM of the year right now is a matchup being The Wolverine and Thor: The Dark World. I'm leaning towards The Wolverine because Wolverine is my favorite hero. Lol. Best CBM of 2014 is a tossup between Captain America: Winter Soldier and Amazing Spider Man 2. I'm leaning towards Captain America: Winter Soldier because I'm a Cao fan, and Marvel Studios has an excellent track record of success.
went with thor. cap 2 is going to have falcon (still going to watch but you know... falcon), amazing spider-man i do not see as great but still will watch it. and no to wolverine because origins let me down so i will not see the movie. which sucks because im a wolverine fan