Originally Posted by
SouthFLpix
I feel that 700 is the smoothest rolling wheel over rough pavement, but 26" wheels have an advantage of being inherited stronger if you are a heavier rider.
The differences in tires (between say 700x25mm and 700x35mm) are going to be much bigger effect on rolling over rough pavement than different wheel sizes (say, 700x35mm and 26"x35mm).