I cheer for the TEAM. PERIOD
If Cam is starting, I will hope he plays well.
If Mac is starting, I will hope he plays well.
I can see either of them being serviceable, with this OL, running game, and D.
The thing is, though, say we go 11-6, make the playoffs, and go 1-1.
During the course of that season, I would expect Mac to learn a lot and get better, if he were starting.
Cam on the other hand doesn't feel like he is on a learning/growth curve. He is what he is, and by contract it apears he will be gone in a year.
So maybe in the course of the season we get to the same place, but going with Mac as starter sets us up better for next year. You only learn so much carrying the clipboard.