Propane(red) burns hotter then Butane(Blue) but Propane(red) cylinders are always smaller and heavier, due to the pressure.
We use Propane(red) during the winter and sometimes in the summer. The biggest difference I think you will find that NO Propane(red) regulators are clip on making them harder to change.
We always take a Butane (Blue) 7Kg Cylinder to Le Mans, The equivelent is the 6Kg Propane (Red).