I'd say it is better in some ways such as width and air circulating around the highs. The highs on the TH-X00 are more separated than the Dogs and I think it is due to the cup shape and the semi-open design which allows sound to leak. I'd say soundstage depth is a tossup and I lean more towards the Dogs for that, we are talking about planar versus dynamics. Also the midrange on the Dogs tends to sound better with guitars and other instruments, there is more naturalness to the sound and I feel that the lower mids on the TH-X00 are a little more recessed. Vocals also sound better on the Alpha Dogs than the TH-X00 with less emphasis on the "ssssss" when listening to female vocals. I noticed that, vocals tend to get a little exaggerated when there are a lot of "s" sounds. Overall if I had to choose one I'd still pick the Alpha Dogs. But these are not headphones that I am going to sell, they are a fantastic compliment and I'd recommend people own both. The Dogs for a more neutral and reference sound. The TH-X00 because of the slight bass boost and they have better soundstage air cause they are semi-open versus sealed. If budget is an issue get the TH-X00 but now that the Alpha Dogs are at end of life sale, you might not be able to purchase them new after the holidays because Dan is going to cease production. Also another thing that it comes down to, would you prefer isolating design or less isolating? The TH-X00 leak a little bit so the person next to you can hear some of your music (not as bad as TH900/600 from memory) but the Alpha Dogs you can crank up in volume and the person next to you won't hear a thing unless they put their ear next to the cup.