Nooo, I recently watched The Martian! So please let me reply to this one.

I liked both movies, because they both praise science and exploring new worlds. There is something about Nolan's work that I really really love. It's amazing how big and realistic space travel felt. Interstellar was an epic experience on the big screen. What a soundtrack... And the girl was cool. But I had problems understanding Matthew McConaughey's talking...
The Martian felt shorter, more fun and I liked the humorous, optimistic tone. For me it was the Feel-Good-Movie I needed after a horrible year of world politics.
But if I am forced to choose I go with Interstellar, because I guess I am a little Nolan fangirl.
And now... back to Jetpack-guy:
Godzilla (2014) or Kong: Skull Island (2017)?