Depends on if you prefer Nintendo's or Sony's exclusive franchises? You really can't go wrong with either. I find it hard to recommend one over the other, owning both.
With 3DS, you get the usual Nintendo greatness with huge JRPG support.
Vita gives you games like Uncharted, Little big planet and Killzone as well as all them great indies. Vita is especially worth it if you want to try something different and if you plan to get PS4 eventually.
Either one should be a great purchase but it depends on what genres you prefer
Xbox One, PS4 and Switch (+ Many Retro Consoles)
'When the people are being beaten with a stick, they are not much happier if it is called the people's stick'- Mikhail Bakunin
Prediction: Switch will sell better than Wii U Lifetime Sales by Jan 1st 2018
