If i could only take one i would take the Vita. Its has multiple functions that work better (like video and music you can take in it aswell to listen and watch) or you can just surf the web and watch youtube if you have a wireless internet connection (or download stuff). The games are down to whatever you want to play. Though it does sound like you have a wider array of games for the Vita. The 3DS would be an understandable choice if you were hellbent on beating Tales of the abyss (im playing it now and im on 50 hours and still got ways to go).
Personally i have alot more games on my Vita than my 3DS. Though if say, it was pokemon or ace attourney launch week i would stick to my 3DS. Otherwise, Vita is a much better portable to have. If you have Persona 4 golden to complete still, then theres no doubt you will be kept busy.







