The Balrog DID work for Sauron. Sauron offered to give the dwarves back Moria, so the balrog would leave if he was told. Granted, it could have been a bluff, but if Gandalf feared that Smaug would follow Sauron and reacted, but didn't set uot to do something about the balrog, it implies that the balrog was weaker then Smaug. I hope this helps.
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