I like both, I own a ca 200 and have for 15 years or so but I moved to Mcintosh 501's and never looked back. Much more refined sound particularly in bass definition and pitch. I think both have very nice midrange but again the Mac is a little clearer and refined.
Obviously, the 501's have much more power and this could account for a lot of the difference particularly since I am driving a tough load with Thiels.
As I said I like both but I really think Mcintosh has upped the ante with power amplifiers with the 501's, 1201's, and 402. I think they are superb especially for the money.