The main reason for me keeping the Holo Spring 3 over buying a Schiit Yggy is the NOS feature.
I have quite a bit of DSD content in my library. Although I have had very good experiences with other Schiit products, the Yggdrasil's lack of DSD support was a deal breaker for me. (before someone suggests it, I am very familiar with converting DSD to PCM)
I was particularly intrigued with the Holo's NATIVE support for DSD. It's nice to not have the overhead of DSD-over-PCM (DoP).
Having an entirely separate R2R network just for DSD was a real bonus. I like the fact that the Spring does not convert DSD to PCM like most DACs.
I didn't have any preconceived notions about non-oversampling performance. I hadn't any prior experience with an NOS DAC. I familiarized myself with the approach and then whipped out my credit card.