Have only used a few Azen cables so I can't comment on the two versions you mention (OP) side by side. I think I had Matrix about 6 versions of hardware prior. Well built for sure.
I do believe the VDH might be very close to the Stealth Indra, as it also used a sort of fine filament wire (maybe carbon) and they were stellar performers. Very open and delicate presentation. New versions way too expensive at $3kish.
I've just switched to Silnote Morpheus as they, in my system, have killed off some of the negatives I was dealing with using Gabriel Golds, Stealth PGS (gold wire), Audio Metallurgy GA0, and a very nice set of Danish Audio Dual Connect gold cables (for sale). I was a strong gold lover but the multi-alloy approach is mo' better to me with recent system changes.
If I was going to go for it in a big way, I would stretch to Kubala Sosna cables but not this year. $$
I will check out the Mountains as they sound similar in construction to the Indras, which I really liked.
Have you considered Verastarr flat ribbon IC's? Heard great things. I use their power cables.