Hmm, this one is tricky, i like 3d a lot but i hold it to a higher standard, like a light sketch 2d can still look decent, but botched 3d is just... too much sometimes
Personally i prefer 3D. Maybe it's because i'm schooled into 3D CAD going the long way from drawing on film to learning computer 2D cad and then finally 3D.
I've said for a long time that porn will go the route of 3D and force feedback suits. It's just a matter of making it affordable for the masses.
I've seen my share of both good 3dcg and 2dcg images as well as bad ones.
With that being said, I feel like you have a better chance at decent 2dcg once since if the dev doesn't have at least a small amount of talent they won't start (usually) a game, while anyone with a video card will just pose random pre-made characters with 0 knowledge of image composition and lighting.