Ok, I own a denim UK, RK and Union Kilt (and a PK for that matter).

Some claim that denim pleats curl more, but frankly that hasn't been my observation. All my other UK's (and I have something in every model) curl more except for the corduroy.

For most traditional look (plus the possibility of matching belt and sporran), the actual best quality of workmanship, and most pocket versatility (though I'd still like pockets on the back too), and best color selection, go with an RK. This thing is bullet proof and will last forever. However, only the outer pleats are sewn. As a result, I have to iron this every time it is washed, something I don't do with any of my other contemporary kilts. With the exchange rate RK is also the most expensive of the ones I have (again only one that is custom sized, and fantastic workmanship.).

For best value the Union Kilt is great. Construction is not bad, but obviously not perfect (slight separation at the back seam, and had a belt loop just come off with in a month of having it). Their strap system is a little odd as well (not bad just odd), and I think it give a little more of a punk feel to their kilt. On the other hand, I love their segmented pockets (RK's are segmented as well, but Union has a flap that covers your cell phone).

Finally, I love my UK. If it came in colors other than Blue and Black and had segmented pockets I'd probably give up wearing any other contemporary kilt. I've tried for years to get them go offer workman like pockets (which I really need for work) since the denim is so much more comfortable that the duc cloth.

So clear as mud.

Adam