The cooler is objectively lower performance and louder from every single review i have seen and read and they dont overclock as well in general. The pcb is worse as well. The only thing the sapphire has going for it really is the very good warranty service, RGB and its small size. For some reason the xfx seems to draw less power to the core than many of the other cards as well.Best based on what exactly ? Long story why I would never buy XFX again , bad taste with RMA. I'm tempted to give the Asus one a go if I don't get the Sapphire Nitro. Circa £30 difference , the Sapphire has higher boost , but can be sorted by a bit of oc'ing , also the lights can be modded on the Nitro
The asus is very good, but the stock tim is very bad and you do need a lot of airflow to prevent it recycling its own air and getting very hot.
As for RMA i have RMA'ed with XFX, asus and msi. Asus are terrible, but i suppose with ocuk you get good service as they deal with it in house. MSI are a bit hit and miss i have to say, but it has been a while since i rma anything with them. XFX took there time, but they did sort me out in the end, but with the rx480 gtr i really cant see this card dying, as it is a lot higher quality than there previous hd7xxx and r9 2xx series cards. I think there new swappable fans will also cut their rma numbers maybe making it a better experience for the few than have issues with the card itself?
I have had 10 sapphire gpu's myself, so i know they can make a good card, but i feel there 390x nitro and rx480 nitro have not really been up to their usual very high standard as have been surpassed by brands less well known for making solid cards.