http://gamrconnect.vgchartz.com/thread.php?id=224807&page=0#
my opinion has changed since this thread, I think Pokemon Stars will come out on 3DS and switch, as opposed of being exclusive to 3ds. I thought the Switch would sell good, but not this good.
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.