I agree with Bill @ Cornerstone, the two are about as far apart from each other as you can get in terms of style (ie. traditional vs. contemporary)
Since I have no personal experience with a McWorter, I can only give my opinions on Nitti cues as I have two right now including a SP that I used as my daily player for over 3 years. Chris is a great guy to deal with and makes a hell of a stick.
I'm sure you can't go wrong with either guy, but you need to decide whether you are looking for "old school" or "modern" designs.