I've played a ton of games and never beaten them, so that adds a lot of unknown gaming to one side of the argument. However, with the about of games being released on the regular and how often indie games release stuff with the "retro" look, it makes it an even harder choice.
I'd have to go with future games as much as it would pain me to never play the Final Fantasy/Dragon Quest/Gears of War/Tales of/Legend of Heroes games I've enjoyed ever again.