I've got some of Jeffs' leather sheaths with the X-loop that allow vertical or horizontal carry on the belt, and love them.

For my SRKW HCLE, and SYK S6 and DMLE, I have the Kydex sheaths, and I can have those as vertical, horizontal, and diagonal carry, and even slip them inside the pants for a slightly angled carry there as well. I don't like them as much as I do my leather sheaths by Jeff (No surprise there, Jeff does amazing work as you all know!), but I will say that they do allow you to be more flexible in how you carry it on your belt.