Quick Draw!

In honor of Red Dead Redemption coming out soon I thought I'd answer an age old question. When you're in a gun-slinging stand off is it better to lead or react? Apparently the person to react draws an average advantage of 21 milliseconds faster but because they are behind on the draw it negates that fact sooooooo the answer is, it's too close to call. I'd say draw first, then you're guaranteed a head start.