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For those who are interested, the following was gleaned from the internet:

Propane, chem. formula C3H8, 13.94 kWh/kg, Butane, chem. formula C4H10, 13.71 kWh/kg, measured at 15 deg C. The main difference in the 2 gasses seems therefore to be that Propane boils at –42 deg C whilst Butane boils at -2 deg C. In freezing weather Butane will not evaporate and so cannot be extracted from the bottle. Butane will also ignite at a slightly lower temperature and burns with a slightly higher temperature than Propane, otherwise they are interchangeable. It seems therefore that the choice of gas must depend on ambient temperature where/when you want to use it, but probably more on availability in the area one finds oneself with an empty bottle.