A question for those who've chosen a Valhalla PC..

I've recently compared the Shunyata Anaconda Helix alpha, and the Nordost Valhalla, and I was quite surprised by the large difference in character between the two. Considering that most PC-savvy audiophiles would call either a 'reference-caliber' PC, I wasn't expecting such a dissimilar sonic signature.
Could those of you who have chosen the Valhalla over the Anaconda Helix Alpha (not the VX) give me some feedback on why you prefer the Valhalla, and what components you prefer it on, including any component on which you didn't prefer it over the Anaconda?
Those who prefer the Anaconda are of course welcome to comment as well, but since there seem to be far fewer Valhalla owners currently, I'm looking for input from them the most.
Please try to put your comments in the context of your system, ie. tubes, horns, large speakers, smaller monitors, etc.
I know it's asking alot, but it seems to me that choosing one PC or the other as a basis for my system will lead to very different paths in upgrades/replacements.
Thanks in advance.