I'm gonna be blunt here.
practicality and sword are not related terms nowadays.
For kata....what sort of kata? what art? what tradition? what does your teacher suggest?
Criswell "katana" is an example of several modern interpretations, but I won't call it a "katana." Yep I'm a real bastid when it comes to this stuff, but since nobody gives a damn anyways, it doesn't really matter.
KC blades are purdy good, Practical katana line by Chen is purdy good. Practical katana is more traditionalish in look, KC are a lil more abusable. Both appear to be hefty and imbalanced, and unless you get a good one from the line, probably not a good idea for kata. You can customize them though and find ways to fix up the balance, either through carving grooves, adding a bit of distal taper, or the old fashioned "make a longer handle" idea. Lord knows enough folks have done that one.
Of course you're not looking for aesthetics or traditional aspects, so there should be no real advantage from one to the other unless you want that slight edge in abusability the KC blade has. I assume you just want something "out of the box" that you don't have to take real good care of, so the KC may have another edge there in the finish, nobody will care if ya do a lil steel wool scrubbing to get rid of any possible rust.
Overall, not much difference at all.