A not-so-special reason why SACD is superior
Aside from the fact that I personally prefer the sound of SACD over DVD-A, there is a more logical reason / fact why I prefer to purchase SACD titles over DVD-A. Simply put: CD compatibility. The fact that many/most SACD's are hybrid discs and playable on regular CD players (and thus also downloadable onto an ipod) makes them MUCH more convenient and financially lucrative. If I buy a dvd-a, I can *only* play it on my one player at home - period. Granted, some dvd-a's are playable on standard dvd players but how many people have a dvd player in their car? My SACD's have a lot more value because I don't have to buy a 2nd CD copy of the exact same title.
That said, I obviously am often frustrated by and do not purchase the single-layer discs which Sony seems to love to sell.