In reply to Joe123:
Whichever you walk around and prefer from the staff at open days to the vibe around the university and the city.
Then look at the course and work out which suits/prefer. Look at all tables for your course rating as they use different metrics.
Now work out which location suits your lifestyle, or which has clubs you wish to join.
Schools are luck of the draw, and as I read from Clarence above, a challenging school can give you greater development. But everywhere has its good and bad schools.
End of the day it is whhichever you feel you will get the higher grade/best experience teaching and general life. Both will be good fun at the end of the day.
Having spent too much time in student recruitment that will be some of my best advice.