Honestly, I couldn't even begin to tell you. I have never listened to the BW 802s with any other amp. I know before buying the MC452, I listened to Classe, Audio Research, Pass Labs, Conrad Johnson, and Krell. I also had for a brief while an MA7000 running Focal 1028be speakers. It is very difficult, if not impossible to go to different retailers and audition different pieces of gear and remember which ones you liked and why. I bought the Mc because of how it sounded to me, the features, looks and the resale value. Also, the rest of the system is going to play a part in the overall sound.
I like to listen to music at fairly loud levels and I think the Rotel, or most low powered amps would clip the way I listen. This link
http://vid1291.photobucket.com/albums/b557/andybernal/20150417_162950_zpskhqfr7yu.mp4, is a clip from Steely Dan's Aja song. This was recorded with my Note 4. It sounds horrible on the phone, but consider that the amp is sitting between 2 subs. Also, the 802s are crossed at 65hz so the lower notes are taken over by the powered subs.
I think everyone suffers from upgradeitis at some point. I already want to upgrade my 2 subs. Either way, I would choose the amp over the processor. They are outdated way too quickly.