User blog comment:PitaKang/FANFIC! :D Muggles vs Wizards!!!!/@comment-3218619-20120822232716/@comment-1630894-20120822234018

The chief factor I think would be the wizards' superior defenses. A wizard is going to have a much easier time getting past any muggle security than vice versa. Also, the wizards to have the advantage of knowing more of the muggle world than the muggles know of theirs