This is a tough decision for me considering I liked both Avengers and Amazing Spider-Man both equally in terms of story. Spider-Man's always been in that special place for me, but really, what Avengers has going for it for me is that it felt like a true Marvel movie. Y'know, the 616 comics ripped right out and put on screen. And meanwhile, Amazing Spider-Man does an Ultimate-esque take that I love just as much.
But as a personal final verdict, I'm going to have to go with The Avengers. Overall, it epitomized the Marvel universe for me.
How did they not do something new with it?
Sure, they had new details here and there, but at the end of they day it was Spider-man's origin all over again. They could of just as easily wrapped it up in an opening montage, yet decided to drag it out in a feature length film.
Consequently, all we can do now is sit and wait until the sequel for them to show us what they can really do with this new version of Spider-man.
I remember TIH and its opening montage which was not only insufficient but raised questions never answered and left TIH feeling like a sequel (either of 2003 Hulk or a never made first movie).
Or you could just see the second half of the movie.