@vthokie83 I had the luxury and pleasure of driving both an M8 and a Porsche Carrera GT some years back. The seat of my pants told me I should opt for the GT. Sadly I am the proud owner of neither. My back and neurologist had different plans for me.
Like those cars another of my senses (hearing) will tell me which of these two boxes to buy. However, I was asking about them from a technical perspective because perhaps someone out there has some insight into the hardware/firmware that might give one a leg up over the other before bring them into my home for a test drive.
Based on comments here, from friends, and others I am leaning toward the A20.
I appreciate the input from all here, thanks.