Monster Hunter for sure.
Spiderman had a huge marketing push (possibly the biggest since Halo 3), and its SPIDERMAN, with a great developer behind it this time around. It wasnt a surprise in the slightest.
2nd most surprising would be GOW.
How is Smash a surprise? Most framchises were diing record numbers on switch, plus this is smash were talking about. Brawl sold like more than 3 million first month.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.