buffered vs. unbuffered outputs?

My rig uses the Mcaormack DNA-1 deluxe amp and the ICs are only 1/2
meter long. The speakers are Thiel 3.6s I don't know what the amp's impedence is but ear-breaking volume is possible if you want it.

Sounds to me you are saying to use the unbuffered outputs.

I'm interested in the sound being most realistic with no embellishment at all.
Does the buffering issue effect this dimension ?
And thanks for your response.
Ed

All your replys were very helpful to me. I've started listening with "new Ears"
and I think you are all correct! Unbuffered sounds more realistic and un-embellished to my ears now that I've taken the trouble to compare really carefully. Thanks again everyone.
Ed