Deathly Hallows Part 2, easily.DH2 is a much stronger film. The story is much more engaging, it's more beautiful to look at, and the score is wonderful. Unlike The Avengers, the action in DH2 doesn't bore because it doesn't overstay its welcome. The music and visuals blend in together perfectly (summoning the statues and creating the protective forcefield). It has its faults, obviously. The Molly/Bella battle was very underwhelming, but despite that, it is an otherwise incredibly satisfying finale. The acting was great, and the humor was enjoyable ("I've always wanted to use that spell!"). I cared a great deal about the characters.Avengers...great special effects, great character interaction, great humor, but the action could get ridiculously overlong, and I felt that the characters didn't sacrifice nearly as much as they should have. I enjoyed watching them, but I didn't have any emotional investment towards them (except the last bit where IM is in space).Really easy. DH2 is also one of those films that gets better with repeat viewings.