Hey J. IMO they're both pretty good choices. Like all Uncharted games, Golden Abyss has a ton of collectibles that may add to the replay value if you're in to it. Uncharted is also probably the best display of the Vita's power in terms of rendering as of right now. On the other hand, Unit 13 is probably at the height of it's popularity in terms of online play, so now is probably a good time to get that one as it's popularity and online features won't last forever. There is also Resistance: Burning Skies coming out within a couple of weeks that has multiplayer and is from a studio with a pretty good track record though they haven't developed any Resistance titles before.