Can't say anything about either city but can offer a suggestion. When my daughter and her boyfriend were moving to Berlin they went for a long weekend and cycled around areas that they thought they would like to move into. They had done a bit of research on the web beforehand on rents and availability, etc. Renting seems to be a bit of a minefield in terms of paper work but they rented for 3 months first (sub-letting) and got to know the area they were in and decided they liked it. They got a long let subsequently, around the corner from where they were. Location near a metro stop was important as well. They also had originally thought they would buy a property, more for investment purposes than anything else, but have decided they won't go down that road.