1. I'd rather hang out with Mordecai and Rigby. The idea of playing video games, goofing around, and then going on a crazy adventure with them in the park sounds nice. While adventures with Finn and Jake would be cool, I feel like I'd die.
2. Finn and Jake I feel are a bit closer as friends. Not that Mordecai and Rigby dislike mind you. I feel like there's just been more conflicts between M and R than F and J.