The Balrogs probably differed in appearance one from another, much like Elves and Men. Gothmog would probably be the size of the Balrog at Khazad Dum or bigger, but there might have been smaller Balrogs. At least half a dozen Balrogs were slain in Gondolin by Tuor and Ecthelion alone, i doubt they could kill that many Balrogs if they were all as massive as the one in Moria. And Tolkien did describe them somewhere as about twice the height of a man or elf. I think that description was in the battle between Glorfindel and the Balrog in the mountains near Gondolin. But i'm not 100% sure, and i don't have that book handy.
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