Tough one. At 60 vs 70 wpc into 8 ohms, the power output is negligible. So besides the obvious aesthetics, the PM 17SA is older and was built at Marantz' reference factory in Japan. The PM 8003 is newer and built in China.
Having a PM15s2 built at the reference factory, I can attest to the extreme quality of Marantz built there, so I would go with the PM 17SA.
Having a PM15s2 built at the reference factory, I can attest to the extreme quality of Marantz built there, so I would go with the PM 17SA.