I agree with getting the Yggdrasil, if the funds allow. It's along the same lines as you can always soften, but you cannot sharpen. You can always take off a layer of clothes, but...well, I'm starting to lose the symbolism now.
Yggdrasil is the most direct-to-the-music possible of the entire Schiit lineup of DACs. If that makes sense for you, both in terms of will the rest of your system benefit from the sonics and can it fit in with your financial sense, then run! Do not walk! The Yggdrasil is it!
I find the Gungnir Multibit slightly more relaxed, but still every bit as musical. The Gungnir is also more portable, fits into a smaller setting, can go more easily to the local meets, etc.
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Musical (take 2) - both Yggdrasil and Gungnir Multibit are musical. You do not lose this in getting more details out from the Yggdrasil. I think that is the concept that is difficult to imagine, due to most detail-oriented devices taking away from the musical nature. The Yggdrasil does not! It gets you even closer to the music. And if you are listening to a talented performer, say Yo Yo Ma on a cello, the Yggdrasil will be more musical. If you are listening to a poorly mixed or recorded track, the Yggdrasil will tell you this - likely making it less musical and more distracting.
This goes back to my statement, can you take advantage of the fidelity of the Yggdrasil? If it makes sense, do it! If it does not, I would actually recommend listening to both the Gungnir Multibit and Bifrost Multibit, because all three DACs are quite musical, at different layers of fidelity.