I've had more "oh wow" moments listening to multichannel discs (SACD and DVD-Audio) than to normal CDs. I think a major problem is that most of the music I listen to doesn't really use recording and mastering quality as a point of pride. My showcase material ends up being music I'm not quite as into, but on the other hand, it's a nice change of pace. Currently, SACDs seem to sound the best on my system, using my PS3 for playback. I have an Oppo, but I'm not as satisfied with it, which I attribute to using its analog outputs (not enough HDMI inputs in my receiver). So DVD-Audio playback suffers. In an older incarnation of my system, I favored DVD-Audio. I've really had fun with concert DVDs, but only a select few. That's a major flaw I've found with putting together a better and better system. Bad recordings abound, which forces me to try to appreciate new kinds of music simply because they've reviewed well in that respect.
Anyway, I've said all that to say that I don't have an easy answer. There's no consistency in quality in any of the formats, but I like having the ability to play each one just in case there's a must-have.
