Having done both wheelchairs and scooters (well not me using them, but having other in them).Can I make a suggestion about a wheel chair from someone who has done that at parks and such? Don't. It gets tiresome to push all day long. It also doesn't afford the rider much freedom. Just think on that... not trying to sway but really it's more work than many realize.
Wheelchairs do get tiresome to push. It is a workout.
I think the only time I would suggest a wheelchair is if the person cannot get out of the chair at all, but likes to shop. Scooters in shops are a nightmare, especially with crowds.
If the person using the chair/scooter can walk on their own for short periods, then a scooter works great. Or if a person has no desire to browse around the gift shops, then again a scooter is better. But if they cannot get our of the wheelchair for short periods, and they want to shop, a scooter gets very cumbersome.