Balanced interconnects vs. Analog

Here is a link that Paul of Clear Day Cables sent me to help me understand the difference and the advantages. 

https://youtu.be/BQtMFsw_3Hg

N

Also, do you want cables that are pure or mostly silver or mostly copper? This does matter and very much depends on particular system and taste. In my solid state system with analog source I use both silver and mostly copper alloy cables in the chain and silver speaker cables. I have warm sounding speakers. It can get a little complicated.
By the way, I used to use DiMarzio pro RCA interconnect, excellent for analog source, good overall balance soundstage and bass, not cold not warm, just about right.

You can buy a 1m used pair of XLRs and resale them if they don't work out.  

I suspect that the correct model designation of your W4S integrated amp would be STI-500, not SSi-500. If so, it is described as a fully balanced design, and the following statements appear in its manual:

The line-stage within the integrated doubles as an unbalanced to balanced converter which provides a balanced signal from unbalanced inputs.

The Neutrik XLR (balanced) connectors are the finest balanced connector on the market, and are the best possible option for connecting your amplifier to your sources.

The description of your Oppo BDP-105 states the following:

The stereo output offers both XLR balanced and RCA single-ended connectors. The balanced output features a true differential signal path all the way from the DAC to the 3-pin XLR connector.

Based on those statements the answer to your question should be clear. At least insofar as which kind of interconnection is likely to provide performance that is most accurate, i.e., that is most true to the source material. Greater accuracy may not always be subjectively preferable, of course.

In general, in a home audio system my belief is that when choosing between balanced (XLR) and unbalanced (RCA) interconnections the designs of the interface circuits in the specific components that are being connected, and also the internal grounding configurations of the two components, are likely to be more significant factors than differences in the intrinsic characteristics of the cables that may be used.

Good luck. Regards,
-- Al

Thank you all for the wonderful input above. Seems the logical choice now is give the balanced connections a trial-thank you!