UWoW is one of the biggest Legion Private Servers offering increased XP rates. UWoW’s realm consists of an English and Russian community. Be aware of this, that you’ll find a lot of Russian players ingame.
UWoW has existed for years (since 2009), making it a relatively stable server in terms of uptime. But reviews and feedback from their Legion realm, have said that while they do indeed have scripted content, there are still a large amount of bugs, as any other Legion server, unfortunately.
To sum up,
If you’re searching for a Legion server, and you don’t know where to go, and don’t mind Russian players, and is aware of bugs, then you can try UWoW’s answer on a 7.3.5 highrated server.