Good endings, preferably. I like bad endings too, but they kind of make me feel down, and because of that, I do the bad endings before the good endings so I can finish a game on a positive note.
Also, when it comes to good endings, the ones I like the most are ones where the game gut punches your feelings over and over and gives out a well-deserved good ending after all the things you and the characters went through. :,)