Right now I'm leaning toward Cowboys and Aliens because Harrison Ford is my favorite actor, but the other 2 look promising as well.
Captain America, but only because I haven't seen Cowboys & Aliens yet, and I'm a huge Captain America fanboy.
Captain America! Highly enjoyable movie, I really had a blast under less than ideal cinema conditions, which is saying something!
I doubt you'd feel that way if you saw Cowboys and Aliens. My vote would have been Apes simply because I haven't seen it yet.
Captain America, not only a great comic book movie, but a great movie period. The other two movies can wait, i seriously don't think you'll have trouble getting tickets for either of them.
I saw Cowboys and Aliens earlier tonight. I'm still saying Captain America. Cowboys and Aliens was badass, but pretty tedious at times. Plus, the badass moments, while pretty cool, are all the movie really has going for it. Captain America has badass moments, heart, soul, drama, comedy, the works.