Balanced Integrated Amp Connection

My amp is a Rowland Continuum 500, integrated. It has RCA and XLR inputs for all inputs except phono, which is RCA only. (Jeff says the ground of the cartridge to the chassis is the same as balanced.

Regarding CDP connection, is there any real advantage to balanced over unbalanced when connecting to an integrated? The C500 converts AC to DC for powering both the pre and power amp sections. My new CDP has no ground on the IEC plug, yet it gives a choice of XLR out or RCA out. Since the amp and pre are grounded together and operating in DC, what advantage is there to connecting the CDP through a "balanced" connection. (I'm only running a meter of Analysis Plus Solo Crystal IC).

It just seems to me that the ground scheme inside an integrated amp is going to be ideal and going balanced for the ungrounded CDP isn't going to accomplish anything.

Dave