Sterling Sapphire or Roma Sorrento mobility scooter?

The best suggestion I ever got was to go to a showroom and ask to try them. Also to hire shopmobility scooters first and have a go on them. A good disability showroom, or even a shopmobility place that knows their stuff (preferably one run by a disability organisation rather than a shopping centre) will be able to tell you what to look for in a scooter - things like advantages and disadvantages of three wheels over four, size, weight, speed, types of controls, etc. But it really comes down to the one that feels best for you.