My palate can't really tell the difference between continental pils malts. I can taste the difference between continental and NA. For me, Castle is a lot more expensive than Weyermann. It's not like Belgium grows a lot of barley, so Castle and Dingeman's barley is coming from somewhere else, probably Germany or eastern Europe.
I like the Weyermann Bohemian malts. The floor-malted kind is Tolar or Bojos, and the regular-malted kind is Hanka. While I can't taste the difference, for some reason I feel better knowing the name of my barley variety.