With Netherwing release date announced for April 1st, 2019 and the horrible Sunwell launch yesterday (ongoing; they still don't know how to fix it) I think now would be a good time to strike. I personally didn't know there was a third TBC contender until after some recent digging on reddit. Nethwing shills heralding their server as the best thing since Gummy's, but it is 4 months away. Many people wasting countless hours today and yesterday trying to log on to Sunwell, but you can play on Nighthaven right now. As I understand it, progress made will be copied over to the new TBC when it drops. Just food for thought.
Edit: Atlantiss' teaser video for Netherwing shows 04.01.2019 but the announcement states January. Whatevs, you can still play the Elysium Project right now instead of getting one shot by the "Connected" boss on Sunwell.