How active is the alliance faction

Since I did a server transfer ages ago from Stormrage to Thrall, I was a horde toon due to my guild switching to horde and moving.
I took a long break from the game and when I came back, the guild is pretty much a ghost town (like it almost was when I left) and i’m thinking of qutting the guild and go back to alliance.

But before I do, i’m curious how active the alliance are (guilds, etc) as some servers are much more horde than Alliance.