Will I get 3DS or PS Vita?

I wondering whether the retro Nintendo games or the more adult PS Vita will be better.(I'm hoping 3DS doesn't just begin to make children's games galore like the DS did but that's a risk so is PS Vita better.
I'm not a casual gamer just to improve the answers.
Update: Myself I think the PS Vita launch line-up is terrible.
Update 2: @ Ballistic Monkey- Yeah I'd buy a Xbox Portable if Microsoft ever made one.
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