Performance aside, you'll have proper drivers. Trust me, after having a painful time with two 290X's, going to two 980's was a breath of fresh air.
http://www.anandtech.com/bench/product/1440?vs=1496
Closest comparison you'll see on there.
http://www.anandtech.com/bench/product/1440?vs=1496
Closest comparison you'll see on there.