But if you already hear no qualitative difference between these versions as a listener, then why not also not the most technically difficult path through multichannel. SACD multichannel is often mixed in 4.0 or 5.0, because it is a priori clear of 5.1 Dolby Surround is different and really compatible systems need five identical full-range speakers in a separate installation. Buyers who place emphasis on SACD multichannel, this fact is well known and they have been then also equipped.
For work, I can only say that these recordings of the 5th and 7th musically among the finest recordings of all time, there is in my opinion no Karajan and especially no contemporary recordings with really. Who wants to hear these milestones interpreting Beethoven in the best possible quality, can not get on this SACD.