SACD has the technical potential to be better than CD, and, of course, it also offers multichannel which, when properly implemented with good speakers all around, is a leap forward. However, not all SACD discs are well mastered, and may sound inferior to well done CDs. IMHO, if you don't go multichannel SACD isn't worth the trouble and expense.
DVDA potential for quality sound is at least as good as SACD. I also note that my very best discs are DVDA. Is this just chance? In addition to quality multichannel sound DVDA often include a lot of video which is interesting to watch once or twice.
In summary, the audio quality improvement from SACD and from DVDA is real but small. The important payoff is multichannel, and between the two DVDA wins.
DVDA potential for quality sound is at least as good as SACD. I also note that my very best discs are DVDA. Is this just chance? In addition to quality multichannel sound DVDA often include a lot of video which is interesting to watch once or twice.
In summary, the audio quality improvement from SACD and from DVDA is real but small. The important payoff is multichannel, and between the two DVDA wins.