I never saw the point of a mobility scooter for obese people. In my case, it was useless and unnecessary. When it became a necessity, I had to have one custom-made.
Up until I reached 650 lbs, I could walk fairly normally, although not very well, and a bariatric wheelchair is a good solution.
The downside is that someone has to push the chair.
In a normal walking situation, where you walk and stop, a wheelchair is the best option.
Standing or walking long distances at that weight is very difficult. But the wheelchair, besides being a place to rest, allows you to go through doorways that are impossible to navigate with a mobility scooter.
Going up a large handicapped access ramp with a wheelchair like that is also difficult for the person pushing, but you can ask for help, and because of the width of the chair, three or four people can fit behind it to push. My previous wheelchair was definitely a waste of money. Designed in steel to support over 800 lbs and ridiculously wide to fit my butt.
Anyway, the wheelchair weighed almost 130 lbs and, with that width, took up more than half a supermarket aisle; sometimes it didn't even fit on the sidewalk, forcing me to go down into the street.
To anyone reading this who's considering making a similar purchase under circumstances similar to mine when I changed my wheelchair: without meaning to be pessimistic or discourage anyone, I'm telling you that you're already immobile and should save your money.
2 months