3DS, no doubt in my mind.
Even a PS3 revision and pricecut won't be able to pull ahead the 3DS in the holiday season. However I think the PS3 can be pretty even with the 3DS (total year sales), or possibly ahead, just prior to the Holiday season. PS3 will come in second.
e=mc^2
Gaming on: PS4 Pro, Switch, SNES Mini, Wii U, PC (i5-7400, GTX 1060)