Best Private Wow Servers
Choosing the right server for you can be quite tricky, however here are my favorite servers, to help you out if you're not sure about looking for them yourself. Obviously the best way to go about it yourself is to go looking for a realm that fits you and i can recommend this wow servers list. These are my servers, in no particular sequence.
Wow mania caters for everyone and anyone who wants to enjoy the WOTLK expansion. It's a era that is still considered to be the best, alongside vanilla and bc. However, most people believe that wow has gone downhill since cataclysm. There are many people on it, and there are a few guilds running raids. Also, they actively pvp on the daily. The server is pretty basic but it follows the if it ain't broken don't fix it, which has served them well.
Retro WoW
This is my go-to realm for vanilla testing, with their instant 60 and active battleground scene it's a perfect place to test out a off the wall build or a new strat. They have a pretty active community and the staff is decently responsive, but it's not really a server i play on regularly since people tend to come play on it in bursts. They create a new char, play for a bit, then get bored. While those bursts are brief, it's still a nice realm.
This server is vanilla, but it's a completely different kind. This is as blizzlike as it gets, xp is 1x, you dont get anything for free and while they do have an integrated cash store, it's mostly for cosmetics. It's the vanilla experience, in a nutshell. The community is very supportive and friendly, and will help you solve any problems or questions. A long haul type of server to be sure.
Heroes WoW
I'd be remiss if i didn't include at least one up to date wow server and this one is it. It's up to Bfa now and lets you play the current content. I suspect that most people will either want to buy the expansion at retail or wait to get the new shadowlands. The server itself is fine, there's plenty of people still playing and you'd be hard pressed to find a better current style wow private server.
These are my choices for best wow private servers. There are many other options, but these are my favorites. However if you're looking for a specific type of realm, I'd advise you to go check out https://serverlist101.com/wow-servers/ where you can find plenty of servers to pick and choose from.