Which is better this GTX 960 - http://www.zotac.com/in/products/graphics-cards/geforce-900-series/product/geforce-900-series/detail/geforce-gtx-960-zt-90301-10m.html
Or
Asus R9 270x -http://www.asus.com/in/Graphics_Cards/R9270XDC2T2GD5/
Or
Asus R9 270x -http://www.asus.com/in/Graphics_Cards/R9270XDC2T2GD5/