The Balrog vs The Witch King

[cellurdur]

Originally Posted by Belegorn

The Balrog could probably fart on the Witch King and remove him from existence.

That's obviously not the case. The Witch King especially at the Battle of the Pelennor Fields was greatly empowered by Sauron personally. I would still favour the Balrog, but Gandalf the White considered him a tough opponent so it would by no means be a walk over.