I have done the test once more today, so 1 week later.
Between the cascade Ciscos and only the PD blue model alone, the differences are minimal. The Cascade Ciscos sound a bit more dynamic and open, however the PD alone is perhaps a little bit nicer on voices. I will do this comparing later once more quickly to choose definitely the best set up for my taste.
For me, the differences between Ethernet cables are bigger , specially between BJ and Vodka, still bigger vs Diamond. Even bigger between vodka and Diamond than between cascade Ciscos and PD alone.
It gives me the reason to think that an ER with linear ps, alone, is probably all I need later.