I studied at Durham University first and now I’m doing my PhD at the University of York. I think there are lots of things you need to think about when you’re looking at University/Medical School. Does the city look like the kind of place you want to live? Do you want a big lively city or somewhere a bit more quiet and relaxed? If you’re doing medicine you’ll probably work in that area for at least 7 years so picking somewhere you want to live is really important. Also are the teaching and research highly rated?
A couple of useful links (but do more research yourself before you decide!):