I own them both, but haven't had them long enough or played enough games to give my answer definitively.
Broad comments - based on major tier one games the Xbox One appears to have a comfortable lead.
Including indie and download only titles the PS4 pulls back some ground.
If you're truly only into single player, there is a tie, or PS4 slightly ahead, maybe.
starcraft - Playing Games = FUN, Talking about Games = SERIOUS







