I would like more clarification, best around town, best hwy, best combination of both, styling, price vs value or just personal choice?
My favorite hwy would be the Xiciting's * with there long wheel base and heavy weight makes them very stable. My favorite around town would be the older Super 8 150 with the big wheels and shorter wheelbase with the People 250S a close second. If I could have only one scooter (God forbid) it would be the Grandvista. It has a stable ride on the hwy but lite enough and narrow enough to be nimble around town, despite it's 12" tires it has a soft comfortable ride. Although some say the styling of the GV is dated I thought it was futuristic for it's time. For affordability you would be hard pressed to find a better value then the Agility series, I have seen Agilities that were severely abused and still running. Styling the Like series seems a eternal favorite and one that I have not owned.
Ergonomics plays a role in the fact we are not all the same some scooters just fit us better then others. * I consider the AK 550 part of that series just more advanced and refined.
My opinion only from riding a variety of Scooters.