How is "Q is powerful" an argument for "the Federation would win in a fight?" The Q continuum are not in the habit of bailing the Federation's butt out of the fire.
That goes double for the Borg, who are in fact the Federation's enemies.
Because the arguement isn't the Federation vs the Empire, its Star Trek vs Star Wars. It was never actually clarified what were the two sides.
Thanks for the awesome avatar goes to Djinn_In_Tonic. Thanks!