I prefer single player but for FPSs i spend more time on the multiplayer.
EDIT: Remove Twisted Metal, Tekken Tag Tournament 2 and some Vita titles, everything i'm planning to buy in the foreseeable future either has a focus on singleplayer or no multiplayer what so ever.
Team ICO Collection
Dark Souls
Skyrim
Dragon's Crown
I'm honestly a bit bugged by the idea that games will just continue to get shorter single player modes and I have no plans to support such titles.
4 ≈ One