I vaguely remember seeing some fights between the Gracies and professional wrestlers. The Gracies were able to win because wrestlers don't train to defend against the various submission holds that BJJ uses they train to pin and to defend against being pinned. A wrestler would have no problem pinning a BJJ practitioner although a BJJ practitioner wouldn't care if they're pinned. The rules of wrestling state that you win by pinning your opponent for a three count or you win by points. Also, chokes and submission holds are how you win in BJJ but such techniques are not allowed in wrestling. So if a wrestler and a BJJ practitioner were to fight under rules where you would win by pinning and where chokes and submissions weren't allowed they would clearly favor wrestling but if the rules allowed chokes and submissions and said that that's how you win and not by pinning than they would clearly favor BJJ. So as to which style is more effective I would say it depends on what style's rules you're fighting under.