Like I mentioned, I have the Crossbreed super tuck and the leather touches me, the kydex is against the inside of the waistband. Look at the website, crossbreed.com.
The leather seems much less likely to cause discomfort than the kydex. If you have no problem with all-kydex, then you have what works for you.
http://www.crossbreedholsters.com/index.html
On the Crossbreed, the leather tends to "fit" to you, the kydex molded across the gun fully keeps it's shape, that's the difference. The larger leather backing on the super tuck spreads the "print" of the holster against your belly or hip, depending on how ya wear it. The clips are adjustable and attached on the leather separately from the kydex. That works for me.