I have read one or two comments in the past that say the McIntosh multi-channel amps aren't that good, but I take that with a grain of salt. I don't think you will get any major difference in sound, but the larger MC462 will likely have better bass control and heft.
B&W 803 D3 speakers - which amp?
I just upgraded my speakers to B&W 803’s and currently have a Mcintosh MC207 powering them for 2 channel music and 5 channel home theater...sound is quite good from the MC207. The question is...how much difference will it make if I switch to a 2 channel amp like the MC462?