Square Enix have released a comparison video showing the difference between PS4 and VITA version of World of Final Fantasy. Surprisingly they look pretty close to each (minus a few graphical effects).
It’s hard to believe that a handheld console released in 2012 is capable of outputting this detail. Granted it’s no Final Fantasy XV, but this is still amazing stuff. Given its Pokemon-like mechanics, it’s a safe bet to go with the VITA version.