I saw a Kinnard on the HMS site (or Ukulele Friend?) not long ago that had x bracing, I think. Sounded fantastic. I don't know if Kinnard is switching over to that bracing, but apparently it would be an option for a custom, at least.
I favor the Fan Braced ukulele. The X Braced ukulele sounds good and I would like to own either one. I think nylon strings, and the other non-metal strings we use, sound best with Fan Bracing. Nylon strings have a broader sound with fan Bracing. But I played Classical Guitars for most of my forever amateur guitar playing life, so my ears are conditioned to Fan Bracing.Matt at WoU just did a really interesting comparison between otherwise similar Martin Beck ukes, one of which has fan bracing and the other has X bracing: