Which RX 480? XFX or Sapphire

Solution
Go with the non blower-style cooler if your case doesn't need blower-style... You'll get much better cooling performance. Plus, the Sapphire NITRO has an 8 pin so you'll get extra overclocking headroom.
2 fans are always better than 1. I would go with the sapphire.

XFX i've had terrible luck with them, over the course of a few months both of the fans on my GPU stopped working. I would stick with Sapphire.