Handheld game systems pros & cons

[dequelo]

I am looking into buying a handheld, but I am having a hard time making up my mind. I like Nintendo for Zelda, mario Kart, Final Fantasy, etc., but I also seen that Resident Evil 2 is available on the Vita, as well as some older classic PS titles.

I don't have a PS3 or PS4, so I am not sure if this is required to purchase games from the sony store.

Any advice will be appreciated.