OK, I don't have many tools for the task, but I'll chime in to defend Mc :-)
Just kidding! You know us Mc owners are supposed to be fanatics and thus have to honor that stereotype :-)
I never heard Cary so can't compare. I do have a MC275, and prior to purchasing I auditioned it in the same system side by side with a SS McIntosh MC252, and preferred the 275. This is to say the 275 doesn't sound like Mc SS. However, the above posters didn't say so either; they said "more SS than tubes". Maybe the Carys sound more like tubes indeed. Maybe that's good for you, Camcocel, maybe it isn't. Keep in mind some people prefer SS over tubes. I think you should try to listen to both before buying.
My two cents until someone more knowledgeable chimes in for Mc!!
:-)