As above, the xfx doesn't have any reviews. I'll be using it for a dual monitor setup, one screen will be gaming and the other will be for firefox,maybe watching a video(doubt this though). They're similarly priced. Is they're much difference between the two, other than the r9 280 having more ram, I can't find any comparison+benchmarks for it either.
EDIT-Here's the links:
XFX R9 280-http://www.dabs.com/products/xfx-amd-radeon-r9-280-827mhz-3gb-pci-e-3-0-hdmi-dd-core-edition-9BSW.html
Asus GTX 760-http://www.amazon.co.uk/gp/product/B00DBPKEOI/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A3P5ROKL5A1OLE
EDIT-Here's the links:
XFX R9 280-http://www.dabs.com/products/xfx-amd-radeon-r9-280-827mhz-3gb-pci-e-3-0-hdmi-dd-core-edition-9BSW.html
Asus GTX 760-http://www.amazon.co.uk/gp/product/B00DBPKEOI/ref=ox_sc_act_title_1?ie=UTF8&psc=1&smid=A3P5ROKL5A1OLE