Well if you’re going to do finance at Durham, then you’d likely have to do the GDL in order to pursue a career in law, so bare in mind that this will incur even more debt. I myself really struggled when trying to pick a uni for law, and the advice I would give is don’t become bogged down by the idea of prestige in terms of universities. They are both good institutions to study at so you will get a lot out of your degree wherever you go. Look at what each uni can provide for you, and which one you would actually better see yourself studying at.