You can compare them deeper at GPUBOSS.com and reviews. I usually look for game results for the game I like to play.
Currently looking to upgrade my failing GPU, with a budget of around £100.
I have settled on either a GTX 750 Ti (various manufacturers) chipset or a GTX 950 chipset.
Obviously, the latter is better by far. But my question is, is the GTX 950 worth the extra £30?