If we are talking about ports that can run easily on vita I would suggest resident evil 4,gta San Andreas or any of the recent monster hunter games
If it's the new games then gravity rush 2(why did they cancel it on vita) for that matter any of the ip's that Sony own. If they start to support vita, later we can think of any other titles from other companies
If it's Android I would love plants vs zombies 2,skyforce or some real time statergy games.