Congrats on two good offers.
I wouldn't pay too much attention to prestige. I suggest that you study what you are most interested in, and choose the university which you could see yourself most enjoying.
Manchester is a large and interesting city. Norwich isn't as interesting, although its medieval centre is attractive, but the Norfolk countryside and coastline are great. Being close to home is good if you like your family, as a quick trip home every now and then can assist with the stress that university sometimes involves.
If you later seek to become a lawyer, it's likely that many of the places you apply to for training positions will recruit university blind.