Well, the guild most TFFers are on, is the PvP server Bloodscalp. At least, this 'was' the designated TFF server as Horde. And the guild is "Band of the Hawks".
That being said, while I'm technically on that server, I've pretty much abandoned it for my other toons.
The servers I am on that I play more, are the PvE servers Aerie Peak (full, so you can't reroll on this one) and Muradin. Both as Alliance. For PvP, Darrowmere and Gurubashi (Alliance for Darrowmere, Horde for Gurubashi).
Suggestion, don't roll in Darrowmere as Alliance (might be better Horde, but not necessarily that much better). This server sucks (I'm staying here only because I'm too broke to transfer out with the character I enjoy playing on it. :lol: ). Gurubashi is better. Though I'm still working on getting to 80 (and my main is guild free). Marudin is okay. Though the reason why I choose it is simply I wanted to move one of my Darrowmere characters (when I still could afford moving characters.
) from a shitty PvP server to a PvE. It isn't that great, and my Draenai Pally is in a 'meh' guild.