The science is really what drew me into this movie. It just touches on very specific obsessions I had about space as a kid. It touches on things I'd hypothesize as a kid, things that I was hoping I'd one day get to see. It may just be a movie, but I can't help but feel that hope as a kid was fulfilled a bit. I really enjoyed Gravity, but Gravity was just a visual treat meant to be seen on the big screen in 3D. I can't imagine wanting to ever see it again in any other format. Interstellar has the benefit of having much more going for it for me to think about after watching it. I almost can't imagine seeing it on a smaller screen, but I know I'd still enjoy watching it at home from time to time.

Honestly, I can't really compare Gravity with Interstellar. They may both be space movies, but they are extremely different from each other

Edit: Out of curiosity, what is everyone's favorite track in the soundtrack?