For direct model comparison, you may wish to do a search in the Vintage Forum at Audio Asylum . Each brand has its fans; especially when it comes to the TOTL model offerings. I currently own/have owned lower powered models from each (Marantz 2240; 2216B; Pioneer 636) and feel that they had about equal tuner and amp sections, with the Marantz preamp being the better of the two brands. If you are considering a purchase, factor in that the receivers, to operate at their best, will need to be thoroughly gone over, and that will usually run at least $200 or so.
Regards, Rich
Regards, Rich