Either are good, ultimately it would probably be up to which uni you like best. UoL is higher on student experience and has smaller class sizes. Nottingham is out of the city, Leeds is right next to it. One thing to think about would be accomodation, the accomodation at Nottingham is a bit prisonish, Leeds is fairly nice as there's different accomodations all over the city, in greener areas, near the dock, right in the city centre, right on campus e.c.t.