Well I think personally the Bucks Course you get turned over with. As the PPL was ending up at 11k £4855 then around £6k for the US. The UK time was so expensive and pointless; why pay to UK fly if your already going to the US.
All the TPC aircraft are GPS equiped and well maintained C152's. You will have a full ground briefing same as Cabair. The instructors are just as good if not better aswell. You also get the personal touch. So in the majortiy of respects I would say TPC over Cabair.