Which car should I get? 15th Birthday?

Okay, so actually my 15th birthday is pretty far away (8 months) but my parents are about to buy me a car. My stepdad just got home from Afghanistan, and he's buying a new car. If I help him pick one out, I might be able to get that one when I'm actually 15. OR, my grandparents bought my aunt a 2009 Black Chevy Malibu and she won't pay the payments and they are very behind. So, my grandparents said that they would take it from her, pay all the late payments and future ones, and it can go ahead and be my car. So, I'm 14 but I would have a 2009 year model car already. And the reason I'm kinda leaning towards the Malibu is because my boyfriend/bestfriend are 16 and we all could drive around in it. What do you think? **Please no rude answers. Thanks guys!