I've had to start a new album so made the decision to go with 9x12 inch pages, which was my intention for next year. Mostly I intend to cut down Design F but I have some other Designs in mind which I'll cover when I share.
I'm far more comfortable with this size. Why? Not sure exactly. If you followed me last year, you'll know I dabbled in 8.5x11 for a few months. I feel 6x8 is too small for my family album and just love filling 9x12. The only thing is there are less 6x4 slot options but I have a few ways around that.