Hey roadwarrier75,
With good cheer, we "agree to disagree" regarding which room was the best!
However, regarding how the Coda No.8 compares to the Bricasti M15 is a great question, indeed. As you know I have reviewed both of them and have had them for a quite awhile in house. They are both totally grain-less, very musical, and will drive virtually any load. The Coda No.8 is very silky, yet very close to being dead neutral in its tonality. The Bricasti M15 is very slightly warmer in tone, and a tiny bit "fuller" sounding. Think slightly silky or slightly velvety in texture.
I strongly believe you better drive both amplifiers with quality sources and line-stages, otherwise you will hear the shortcomings very easily of your upstream gear.
They are both beautifully built wonderful amplifiers. The Coda No.8 is half the price, so it's even a less expensive way to get to a world class reference level of performance. If price is not the deciding factor, it would come down to personal taste and system synergy. They are both great.
If you live in the Chicago land area, Mike Kay of Audio Archon is the local dealer for both Coda and Bricasti. You could setup an audition to see which you might prefer based on your taste.