Hm both are Maia, the only difference is the age of them. The Balrog is maybe far older than Saruman and he could have more battle experience through the war with the Valar.
I think it could be a close battle, but the Balrog wins via high dif.
True but I think they both have been around since Melkors time right?
Yeah,but theres no mention in the books that the istari fought in the war against Morgoth. They first arrived in the third age,maybe they lived a peacefull live in valinor before they were send to Middle Earth.
The books are not very accurade with their history. But we know surely that the Balrog fight in the last war against the troops of the valar and escaped to Moria.
@proteusxmanrxis: What low balling for Sauruman guys..
I see no lowballing here. We have two equal beeings (both Maiar created by Iluvatar),the only difference is their battle experience. And for this,the books are to inaccurate.