I say fuck it and let everyone compete together. Ain't no reason men and women couldn't compete with each other in baseball, basketball, hockey, tennis, golf, etc. Even if you believed men are capable of being bigger and supporting more muscle, there's tons of sports where that isn't going to be the most useful thing to win.
How would you know this gender or that gender is better anyway unless you actually let everyone compete together, regardless of what's in their pants or their heart?