The answer to this question will depend on where the scooter will be used most frequently. If the scooter will be mostly indoors, the 3-wheel scooter would have the advantage because of a much tighter turning radius. Turning through a doorway from a hallway is much easier with a 3-wheel unit. One of the downfalls of a 4-wheel scooter is its large turning radius. If the equipment will mainly be used outside and off of pavement, then a 4-wheel unit has the advantage. The increased stability of having two front wheels is a big plus, making for a noticeably more comfortable ride.