Vita or 3DS?

[Pokemonbrawlvg]

I can't say which is better since I only have a 3DS, but 3DS is slowly becoming one of my favorite Nintendo handhelds of all time. 

 

I also think you should look at future releases in the upcoming months for both systems (Note: This is North America and only tracking the first three months of 2013):

3DS

Feburary

Fire Emblem: Awakening

Etrian Odyssey IV

Brain Age: Concentration 

March

Luigi's Mansion: Dark Moon (no NA date confirmed yet, but pretty sure it'll come around the same time as Europe)
Castlevania: Lords of Shadow - Mirror of Fate
Monster Hunter 3 Ultimate

+ (eShop)

Tokyo Crash Mobs
HARMOKNIGHT

Vita

February

Sly Cooper: Theives of Time

Earth Defense Force 2017 Portable

March

MLB 2013

Soul Sacrifice (probably, but it could release near its Japanese release)

Don't know what PSN (or other Vita) titles are available, so fill in if I miss anything