Also compare like for like. Check how each establishment charge an hour ,ie tacho / hobbs / airborne time / taxi time / airborne plus ten minutes etc.
It is amazing how some schools charge an hour. Also consider ground school fees, exam fees, and membership.
Then look at the instructors, are they teaching to hour build or as a vocation.
Cost is important, but value for money is more important. Go to the establishment you fee most comfortable with, and as mentioned above do not pay up front more than you are prepared to lose!