I have both and use the Supertuck. The only difference from my experience is the rough side of the leather is toward you on the Supertuck but the opposite on the Kolster.
To me this makes the Supertuck stay put and the kolster moves around more. I like the clips on the Crossbreed better as well.
For what its worth my most used holster is the Bulldog "Mike" IWB holster from
http://www.bulldogleathercompany.com. It's not tuckable but for the comfort I do my best to dress around the holster which is much easier this time of year.