I have been going through my classical SACDs pulling out a number of titles to sell, and it seems that I have two Mahler's Symphony No. 1 disks. Both are multichannel and still sealed, and I plan to keep one of them. Since I can't listen to either without opening them, I am hoping that someone can tell me which one they would keep. Which has the best sound quality and the best surround sound production? Here is a photo of the two titles. I would appreciate hearing your input. Thank you.