Should i buy the 3DS or the 2DS when it comes out?
...it already released though...
2ds is out, at least in US. If you want to carry it around, 3ds is better because it folds. 2 ds is cute. I don't get the point of it, it's just a weird tablet. My mother has one, she collects ds's, that's how I've seen one.
What ever cost less
With any game system my choice depends on the games. Which system has the games you want to play?
If money's an issue go the 2DS route but if not than get a 3DS but I would get a backlit GBA SP though since I already have a 3DS