Depends where you want to practice law afterwards. Scottish degrees usually aren't qualifying in England and would require you to complete elements of the GDL afterwards which would take you from a 3 year degree in England to a 5 year degree (inc. conversion) in Scotland.
York is probably best for reputation (although it doesn't really matter in law) and for nightlife - especially with its proximity to Leeds and transport links. Lancaster university does not have the transport links to anywhere because it is quite rural for nightlife. York is also be more attractive city out of the two as well.