The hellhound variant also looks interesting with the middle fan spinning the other way.
In reviews that I found, the Hellhound didn't get as consistently positive reviews. The Red Devil seemed to be amongst the best for thermals, volume and performance. I also like that the Red Devil has a direct ARGB connector to lead to the MB for easy sync without the need for additional RGB software.
*EDIT* There's also an entire 8 pin connector difference between them. It's odd to me that they aren't THAT different in their numbers, but one seems to warrant a third 8 pin power?

