I got an iPad 3 months ago and I was amazed at the amount of stuff you can find in the appstore that cost almost nothing (especially if you shop during sales). I bought Nightsky, Little Inferno, Plants VS Zombies for 0,9 euros each and Mutant Mudds for free.
Yes most of the 3DS exclusives are games of great quality (Pullblox is a gem of a game), but right now almost everything in the Nintendo eShop looks seriously overpriced.