I've compared Valkyrja, Valhalla, AZ Absolute, and Stealth Indra in a system I'm very familiar with (not my own, but I've spent many, many hours listening to it) and 2 other systems I've listened to quite a bit. From what I've heard, the AZ Absolute is roughly equal in quality to the Nordost Valkyrja, though depending on the system, either could be a better match. Looking at Teajay's system, I'd guess the AZ would be the better match, based on what I've heard. However, I preferred the Nordost to the Acoustic Zen in all 3 systems. I've only heard the Indra in one system, but in this case it was an order of magnitude better than any other cable I've experienced.
The Acoustic Zen Absolute did some things very well... it's more dynamic than the Valhalla, though I'm not sure I felt the added dynamics sounded entirely natural to my ear. They do some instruments very well, especially acoustic guitar. However, they added an annoying edge to vocals that I didnt like. That edge on the vocals alone would be enough for me personally to rule them out, but I felt the Valhallas were better in almost every other category.
When it comes to cables, I don't think there's ever going to be an absolute best. System synergy and listener taste are far more important than anything else. Even in a hypothetical system with no weaknesses, some listeners are going to prefer colorations of the sound, and some no coloration at all. My preference is Stealth Indra, followed by Nordost Valhalla. I feel these cables let the music through with no detremintal effects (Indra) or very few (Valhalla). I am not aware of anything I can recommend more highly, but if your tastes differ from mine it's entirely possible that you may hate both.