Oooh that's a tough one. My bf is the world's biggest movie buff and gets all fretty if we don't go to the theatre at least once a week, and I must admit the whole experience is great. But I think I prefer staying at home in my jarmies cuddled up with him and popcorn and pussy cats watching DVDs in the comfort of my own sofa bed!
Personally, I like to watch movies in the comfort of my own living room...BUT it's fun to go out to the theatre every once in a while...especially Century Cinema (a fancy shmancy art house) or The Music Box (old vintage theatre that does midnight showing of cult classics like Harold and Maude, Ferris Bueller, Rocky Horror Picture Show, etc.)