I don't think any dwarf was really a match for the Balrog. I mean, Balrog single-handedly killed two of the dwarven kings and banished the Longbeards out of their ancestral home. The dwarves fought Balrog but they couldn't beat him in any way.
I would expect the dwarves to throw everything they have at the greatest menace that appeared in Khazad-dum since the beginning of the world. So if they weren't able to defeat the Balrog... Maybe Durin's Bane was lurking behind the corners and killing single dwarves, so no fair battle occured. But even if it did, Balrog's horrid appearance combined with unthinkable anger for being woken up plus the fact that he is a Maiar spirit would certainly prove overwhelming for them dwarves. Even more so than the dragon, a lower being so to say. And we can say the dwarves had some experience fighting the dragons, but definitely none fighting balrogs.
This discussion had some interesting posts:
http://forum.barrowdowns.com/showthread.php?t=1689