Audiophile network products compatible with Verizon Fios

I haven’t experienced any issues/dropouts when streaming music through the existing Actiontek MoCa device (WCB3000N01) and wonder if there are sonic improvements to be had simply by upgrading to the ECB6200 adapters you mention?

Is my understanding correct that within the realms of the Verizon Fios universe, IF I want to watch TV than I MUST continue to use the Verizon router?