The volume control turned out to be what tipped the Okto over the Yggdrasil. There’s very little difference in sound between them. If anything, the Yggy may have a touch more warmth, but it’s not enough of a difference to get me to forgo the volume control, so I’ve already sold the Yggy. To be clear, if you have a Yggy Less-Is-More DAC and like/love it the way I did mine, and have no need for a volume control then I would not make the change.
Both of these are excellent DACs that punch way above their price points, so it’s hard to go wrong with either. I just finally snagged a pair of my dream headphones (HifiMan Susvara) at a great price so I’ll soon have an even better window into the sound of the Okto, but I’m not worried that I won’t like what I hear. If it were a house you’d say it has great "bones", meaning it’s just fundamentally good. It’s entirely possible still that the sound of the Okto will eventually surpass the Yggy completely, but I honestly don’t expect that to happen. I have enough hours on it now that anything more than a very subtle change would be improbable.