Re: Age of Ultron or World's Finest
World's Finest is the more interesting concept, but the talent involved with Age of Ultron is far better, especially behind the camera.
Typically, talent trumps all when it comes to Hollywood (a bad concept directed by Steven Spielberg will probably be better than a good concept directed by Uwe Boll) so I expect Age of Ultron will probably be better if I had to bet on one. I could easily be wrong though. It is really way too early to tell.