I've been playing WOW for 4 months now.in thaurissan realm,i swear if any of you wanna make an allliance character in Thaurissan,i think u better reconsider,even the horde population is more than alliance.i made a alliance in thaurissan b4,ive had it at about lvl 30++.i deleted my ally and made a BE.I should have picked a orc btw,because ppl say BE look like wussies.so anyway,i made an alliance lvl 12 only,it was a temporary char,that was 1 yr ago,my fren have a 10-day free pass to me,i gave on the 2nd day,and make a horde char 3rd day.horde owns in US servers last time,i dunno wheter it will be the same now?i been doing some PVPing in thaurissan,i think nowadays allys form a PM when PVPing,but to tell you the truth,horde pugz really suck,if youre and wanna win,better get a PM no matter what,lol.
Well,what do you guys say?

It all depends of battlegroup, server player base and population.

My server Zul'jin is in Ruin battlegroup, it is notoriously known as the worst Horde battlegroup in US WOW for some reason.