I still haven't made my mind up on my first choice of uni but I would advise going to the uni campuses if you haven't already.
Open days are a great way to hear more about your course/ get a feel for the uni.
Read up online about the course you're applying to and see which one interests you the most.
Also trying to get in touch with students at your chosen uni choices (maybe through this website) to see what they think of the uni.
See which uni is most reputable so in the end you'll qualify with a uni degree employers would value.
But overall you should pick a uni you think you'll see yourself most comfortable at and where you'll enjoy your time at uni.
Hope this helped!