Balrogs more powerfull. Lets say that there is no debate on dragons actually being Maia spirits. If this is the case, then in my mind, *if dragons were Maia spirits*, then they were trapped (by Morgoth) in serpents bodies. To me, this signifies a significant lower class of Maia spirit than a Balrogs.
I would characterize Balrogs as *more evil*, because they are a "purer" form of evil - being the original manifistation representative of the flaming evil spirit that arose at the dawn of Maia existence. Dragons (IMO) may show more "evilness" at certain times because they are definately more independant minded than Balrogs are. But the "who is more powerfull\evil" debate by the 3rd age would definatelly be the Balrog, since any dragon by that time would be a 3rd, 4th, 5th generation of breed. This is assuming that there is some kind of watering down effect on the original Maia spirits that occurs over subsequent generations.
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