There's no clear answer. Sure, a Radeon card might perform a bit better than it's geforce counterpart and vice versa on some games but almost every card starting from the HD7750 (AMD Radeon) or the GTX650ti (Nvidia Geforce) and upwards is a good purchase as long as you don't pay well over their retail price.
Giving us your full PC specs, target resolution for gaming and the games you play can help us a lot in giving you better recommendations so let's start there.
Since it's not out yet then how should I know it'll be a good purchase or not? It might be like this current gen where the 680 is a bad purchase since you can get 90%+ of it's performance from a card that is around 80% of it's price (GTX670)
You can't guarantee everything just by looking at leaked technical specs, which I believe is not necessarily accurate.
I have a problem. I want to buy a card but i don't know which one i should choose. If you help me whit this i would be grateful. Here is four option, please choose one.
A) AMD B) A C) D D) B and C
Note: There is no other option and please don't try to be funny.
This message sounds like you was trolling with the A B C D talk and knowing the 700 series cards hasnt drop yet was the icing on the cake. But if i were you i would wait a bit untill the new series comes out then choose wisely instead of buying now E.X a 670 and a 770 comes out then you sitting there thinking F i should of waited.. If i dont see a major jump in the 770 im sticking to my 660ti but in my case the 770 would be worth upgrading