I'm unsure how to answer this, honestly.
I rarely buy a game based solely on gameplay as I seldom play it before I make the purchase. Nor have I ever bought a game solely based on its graphical prowess.
I suppose the biggest factor in me buying a game would be familiarity, be it either with genre, series or developer.
As for a new IP, from a new developer (to me)... hmmm. I suppose, as ridiculous as it may sound to some, simply which one piques my interest most. I realize that's rather vague, but I can hardly think of any case where I'd say any particular aspect of a game trumps any other aspect.
However, given the two choices, more often than not - gameplay.







