sorry you are correct I do see more of the 50cc models. Vinos are 4 strokes only the zuma 50cc is a 2 stroke. as far as longevity the 125 is the same as the 50 they keep on going with good maintenance. belts do not need to be replaced as often on the 125 because it has some power and not running full throttle all of the time just to get down the street.
I feel the smaller wheels and suspension are not as safe as a full size motorcycle. are you using the Vino for fuel concerns?