Whatever your speakers like is the best in the end..Or it could be the other way around.
EQ no eq .. Loudness no loudness, Head/room on and on.Synergy as stated above is the ticket.
Best-
Boozehound
That's it.. both those units represent the best of those very popular brands during the early years of quality stereo systems becoming mainstream. Both are good and rare. I would keep both of them.. would probably prefer the sound of the Marantz, but that particular Pioneer is a nice sounding unit... not that others are bad.. and has nice, audiophile controls like mode, and individual channel tone controls... embossed face plate. For me, between those two, forced to decide... I don't know.. probably the one that consistently sounded better, which removes that answer from the OPs question since he can't make that kind of comparison. Keep them both... save money, be patient, and wait for a pair of speakers that present the same dilemma, that way you'll evolve a nice sounding and classy vintage system that will always be a source of pleasure in your life.Technical stuff aside, I think the point here is that BOTH of these devices are good and rare. You are lucky enough to have found both.
Yeah.... between those two units especially. If one goes, it has to be the Marantz because of it's cosmetics and the pristine condition of that particular Pioneer, the SX 828. If both were pristine... that would be problematic.... best sounding among two pristine units versus the very subjective attractiveness factor.All this keep both talk. Just think, you are still on the hunt and keeping both every time you gear another unit leads to a bit more gear than you can handle. I would enjoy one find more and move the lesser condition units on to keep the slush fund available to grab something else when it is presented. That means the 2270 goes when you are ready to let go and hopefully a much better looking 2270 with a nice walnut cabinet will take its place or some other unit in great shape.