99% of the data on wowhead is what I would expect from people doing it for the transmogs except for:
Restoration Shaman- Necrolord
Holy Priest- Necrolord
Brewmaster Monk- Secondplace being Necrolord.
Fire Mage - Night Fae (not sure what best appearance wise would be maybe Kyrian/Venthyr)
Feral Druid - Third place being Necrolord. Venthyr has a better leather set unless you are undead and undead cant be druids.
It would be interesting to see what races picked what covenant because I feel like Necrolord works good for undead and DK's but not many other races/classes.