If I had to choose between the two, I would choose YBA. More musical to me.
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No matter which amp you choose, the synergy (match)between the system (particularly the integrated) and the JBL's is really the key. You're probably buying used from Audiogon so there's no way to audition in your system. So it's always a gamble. I had one YBA product in my home (the Audio Refinement Complete). It seemed pretty musical to me too.