Interstellar has some incredible moments in it but as a movie, it is very uneven, and I am not a big fan of the ending. Gravity has a minimalist plot but it sticks to its game, and come out a winner. Apollo 13 is a superior movie to both -objectively speaking, less visually stunning than Gravity, but it has everything in it: plot, human drama, team work, Americana that doesn't make you cringe. However, Gravity is still my favorite
I haven't seen The Martian but judging by the overwhelming positive reviews, it may be difficult to meet the over-inflated expectations. Now everybody is expecting a masterpiece, not just an effective space thriller, from Ridley Scott.