FYI - after doing the burn-in, my reaction on the Schiit Vali amp is that it is a reasonable choice for the Mad Dog, but less suitable for the Alpha Dog. See the Vali thread if you want specifics.
I continue to find the Alpha Dog to be a superior choice for all acoustic music. The resolution, detail and soundstage are better than the Mad Dog, and the strong points of the Alpha Dog are shown to best advantage in acoustic music, especially classical music.
With EDM, reggae and similar bass heavy music, I find the more pronounced bass and slightly greater perceived dynamics of the Mad Dog can be more enjoyable than the neutral and flat Alpha Dog.
In other music, it can be a tossup. For example, on Dark Side of the Moon, the Alpha Dog is enjoyable for its detail and soundstage, while the Mad Dog is enjoyable in a different way for its perceived dynamics and stronger bass.
Having said this, each does a fine job on all genres, and you can enjoy all genres regardless of which you choose.
Edited by kstuart - 12/2/13 at 5:41pm