While the Corsair HX PSU is very good, XFX PSUs are built by Seasonic. Seasonic is among the top-quality manufacturers in the industry.
All things being equal, I'd go with the XFX.
Though, if the Corsair is a better deal, I wouldn't hesitate to use that PSU either. You'd be saving money and the quality would be nothing to scough at. It's built by channelwell. This is the company that Corsair used which put them on the map as a PSU design company with the TX series. I had a TX950. Definitely a solid PSU.