Meteor strike uses less mana. Until you are mana rich it might be a wiser choice.
Cleglaw
Someone else quopted this on the forum once, " Meteor is like having a machinegun" I mean at what ... 1 manna per burst most Warriors can let loose with a 50 burst shot and that just about kills anything in the beginning parts <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />