well, gandalf never tried to destroy the dragon. I think that in part it would depend on wheather or not fire can in-fact harm a balrog. I think it cannot. also it depends on the dragon, and the balrog. IMHO the balrog in moria would have had the upper hand in a battle with smaug, because i think that the balrogs offensive weapons outmatch the dragons if fire is not in the cards. However this is only the case if the dragon remains on the ground. This is because given the little info provided in the fellowship of the rings leads to the conclusion that at least the Balrog in moria cannot fly. so the balrog would have the upper-hand in tighter quarters, and the dragon out in the open.
In short, i assume The Balrog cannot fly because the breaking of The Bridge of Khazad-dum was supposed to keep the Balrog from getting to them
This kind of questions is hard because there are so many assumptions. sorry
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