mcintosh c42 vs c46 experience?

i will use my ma6500 as a power amp

any opinion about this 2 preamp?
I have a C42 and think it's a wonderful preamp, but it is not the last word in transparency and detail. At its worst it masks subtle differences in recordings. For some that's a big problem. For others the rich tonality, flexible input/outputs, 8 band tone controls and multiple tape loops compensate for the slight sonic deficiencies.