The Elves had weapons forged by master smiths, and many of them were blessed with the light of the Two Trees. It is not the common elf who kills balrogs, but the really cool elves like Glorfindel. The nazgūl did not have that kind of weapons to kill balrogs. E.g. the morgul knife poisons you, but I don't think a balrog can be poisoned like Frodo was. The swords that the nazgūl wields are hardly powerful enough to harm a balrog.
And I think the nazgūl has so much power over their horses, to prevent the horses from just running of. Glorfindel had a torch, and it was his combined might as an Elf-lord together with the fire that made the nazgūl, not their horses, ride into the river.
My opinion is still that the balrog could kill the ring-wraiths without trouble.
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