I used to play alliance around 2006-2010 before I left wow. Alliance used to be a bit more populated because while the horde racials were often better, not everyone wanted to look quite so... bestial.
Alliance with night elves and humans had the prettier races.
This was completely turned on its head when blood elves were released in tbc. Now the pretty race is horde only, they are much better looking knight elves, and even the atrocious male blood elf casting animation is not enough to dissuade people from being blood elves. I only play male characters, and my human mage looked like a roided out mess, but that was the best I could get when I started. Now I have a blood elf mage, and he looks much better as a caster, not like I've been bench pressing gnomes instead of studying the arcane arts.
I look... amazing. But this has come at a great cost, because most people choose blood elf on the horde side, the horde tends to have a higher population of players than alliance. It's not irredeemably lopsided, but it makes my bg queue times longer than instant, which is what I'd prefer.
There is a solution to this, either fix the models of human males so they actually look good (human kalecgos model looks good), human males need a second body type option so they can look like an actual caster and not like someone that ODed on steroids, or.... a more radical fix, give alliance a pretty race.
I have racked my brain regarding what such a race could be that would fit into the general wow lore, and I think I have it. A lost race of titan creation, hidden by Norgannon before he fell to Sargeras. I don't know what these people would look like, but if they did have facial marks, they would NOT be tatoos, they would be lines of power running through them. The males would NOT have what was done to Dranei where the females looked lithe and caster like, but EVERY MALE looked like a blue buffalo in training....
To build on the lore of wow, you could say that Norgannon created these beings to protect and speed up the development of the world soul of Azeroth deep within Azeroth, where they have kept vigil until.... something threatens the safety of this soul.... (like, oh, I don't know, the legion coming to Azeroth and gaining a foothold in a future expansion/update)
or not, this is all over the place, but alliance needs a prettier race, for the MALES. The women almost always look great, but when it comes to the male models, the only mode is buffalo/steroids, blood elves were the ONLY exception to this. And this is why they have a higher population, and why my bg queue times are not instant.