My suggestion would be to connect your disc player to your receiver using both an optical and analog connection. Then, see for yourself which one you prefer. Personally, I prefer the convenience of the digital connection (single cable) and the lower chance of the signal being degraded over the connection.
My guess, although I can't say for sure, is that the DACs in your disc player and in your receiver will perform similarly. I say that because they are both 192kHz/24-bit DACs and both components are of the 6001 line. Just a guess, though.