Yeah, because you can totally find a game like Vain Glory on a 3DS.
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A real handheld? I will buy an iPhone, thanks. The 3DS is severely underpowered compared to any other gaming handheld (ex: PS Vita).
The ONLY thing it has going for it is Nintendo's generally excellent first party games. That being said, Pokémon is pretty bad. It lags with 3D on, which is a disappointment because you can see the game was clearly rushed. Games like Zelda ALBW don't have this issue and they are full 3D.
Third party games for the 3DS are absolutely terrible. On the iPhone, this is not the case. No one buys a 3DS for third-party games. And that's why games like Vain Glory, Monument Valley, Clumsy Ninja, GTA:SA (yes it's a port) etc...will always outshine most 3DS games that aren't the classic Mario/Zelda/AC/Pokémon, etc.
iphone will never have anything like smash bros or Fire Emblem either. A dedicated handheld will always be better for real gaming. Of course the 3DS isn't as powerful as a current iphone, seeing as it came out before the iphone 4S.