Ringers vs. Potterheads
Two twee fantasy universes, written by self-effacing British authors? That would have been enough to stoke the rivalry between fans of J.R.R. Tolkien's The Lord of the Rings and J.K. Rowling's Harry Potter series. But the gauntlet was really thrown down when both series premiered their film adaptations in the same year. Even so, the antagonism between Ringers and Potterheads is probably as much of a canard as the Trekkie/Jedi war — most fantasy lit fans would be equally happy spending time in Middle Earth or at Hogwarts.
That said, if Gandalf could take a Balrog down, he could wipe Harry out in about two seconds flat. You don't bring a wand to a staff fight. JUST SAYIN'.