The way most of the Encore's shows are staged, most things happen pretty far downstage, so I would prioritize sitting close even if it's on the side. The rear Mezzanine feels like a million miles away.
Sight lines are pretty good at CC. I've been in both the mezz and the balcony without complaints. I've never sat EXTREME side, as I'm always wary.
If we're not having fun, then why are we doing it?
These are DISCUSSION boards, not mutual admiration boards. Discussion only occurs when we are willing to hear what others are thinking, regardless of whether it is alignment to our own thoughts.