The Vita version is currently cheaper than the PS3 version and also gets my vote because of the Vita's handy sleep function, meaning you don't have to keep playing until you reach a save sphere. Being able to level up in small doses works wonders for the game and the Vita version looks absolutely stunning too. FFX has aged wonderfully and offers up huge depth for you to discover all over again or even for the first time if you're really lucky. I've not made it to FFX-2 yet, but Matt's given his verdict in the link above. Be warned Vita owners, the second game comes as a hefty download rather than being on the cartridge.
Thanks to eOn at HotUkDeals.