I am one of the fans of the Scroll wheel on the 5".
When I first got my PEz, I had never used a e-reader before and tended to use the turn keys on the Left. Somewhere I found, being Right Handed, that the scroll wheel was easier to use.
I also tend to read at home without the cover (Travel=cover in place) and find the light weight very comfortable.
I suspect the reason Polly does more page turns on the PEz is, like me, she runs at a slight higher Zoom level because of the smaller screen.