You will find both to perform brilliantly. That's all you need to know. You can't go wrong either way.
Both cost about the same when new. The Yamaha is the nominally more powerful unit (145 W / 8 ohms and 250 W / 4 ohms), has extremely low noise in Pure Direct mode if horn speakers are your thing, but in return this and the preceding series are not uncommonly plagued by input selector problems (they issued an upgraded spare part which holds up better, IIRC it's about 80€ plus labor).
I have now a working, Pioneer A-602R Amplifier! How much will I get with the Yamaha AX-1070? I might get it tomorrow!
I can also get a PIONEER A-717 Dual Traffo but I have no info on it! Is it dual mono? How good is it? I am affraid of the Yamaha AX-1070 not to develop the black brumm on the speaker relays. I never had problems with Pioneer regarding this question. I also had a Kenwood KA-5090R that was putting a painstaking workaround job for e cleaning the relays every 2 years, hated that, it was hard popping off those caps of the relays to get to them! Eventualy sold the amplifier! And ist that true, that you have to turn your amplifier always on, with the volume pot low untill the relays couple so that it does not develop the brumm? I always did that and still do, just as a safety measure. Volume down to minimum, power on, relays couple, volume can be turned up and listen to music.
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