I'd say Barton. It's a very friendly airfield and even though it isn't owned by a club it still has that club feel whereas BPL doesn't have any atmosphere at all.
Barton has a very friendly Flight Information Service and although it isn't an international airport like BPL it is still busy enough to keep you on your toes and develop you into a confident and proficient pilot especially due to it's proximity to Manchester and Liverpool.
The schools at Barton are well established and have very good instructors. Try LAC or Manchester Flight Training and ask for a look around the tower and airfield to see what you're paying for.