should i buy a vita or a 3ds?

[Mnementh]

Depends on the games you like. Example:

Do you like Atlus RPGs? Get a 3DS: Etrian Odyssey IV, SMT IV, SMT: Soul Hackers, SMT: Devil Survivor Overclocked, EO: Millenium Girl and in the future Persona Q.
Do you like shooters? Get a Vita: COD, Killzone, Unit 13.