All mobility scooters carry a weight restriction so this is one important factor when making your decision. 

What will your frequency of use be? 

Will you usually be alone when using it?

Are you able to ​carry/lift take it apart unaided? Will you need to purchase ramps or lifts to assist you?

Large scooters and mid range scooters cannot be taken a part and put in a car boot, so although the bigger mobility scooters are more luxurious and usually have a much greater maximum weight capacity if you want to go on holiday or use occasionally for shopping, meeting family and friends, a large scooter would not be suitable for your needs.

Boot scooters and folding scooters are superior when it comes to flexibility and using at your convenience, but they usually have a much lower weight restriction and do not provide the comfort, speed or distance the bigger scooters provide.