Fully balanced offer some advantages in noise and harmonic distortions but everything being equal, the design would result in much higher cost. I don't trust low cost (relatively speaking) truly fully balanced from input to output amps so I would avoid such amps at the price range of Emotiva's but that's just me. I generally believe if it seems too good to be true, it probably is. If either one has more than enough power for your need, I would take the A23. The hearsay talks of better sound staging, detail, clarity, grunt, punch, dynamics are mostly bs, unless power output is an issue.