Lee there are a number of things you need to consider, the fact you are under 25 will reduce your choice considerably.
Then you need to consider your disability, you will have the car for at least three years so, although it would be great to pick a car that is a “babe magnet” it has to work for your comfort first, and foremost.
Then we have budget how much do you have to spend, I, as an old codger, went over the top with our first motability car paying an AP of £4,000. So I can imagine the temptation for a young person to “splash the cash” and get a car the envy of your friends but remember the car is not yours, you could of course purchase it at the end of the three years but in the mean time it belongs to motability.
There are many knowledgeable members on the forum so if you give a few more details of your needs and finance I’m sure you’ll get a few good recommendations.