That's a rather subjective question that's almost impossible to answer. It also depends on what you call fun. Both would be fun to drive, but if I were to make the choice purely on the driving experience I would choose the BMW.

Some run-flat tyres are marked that they can't be repaired, but that's not necessarily correct we've been told. Run-flats can be repaired providing the sidewall hasn't been damaged by being driven too far after the tyre deflated. There are tyre dealers other than Bridgestone dealers who have the equipment to remove run-flats from the rims and repair the tyres. Bridgestone have an equivalent conventional tyre to your run-flat and these can be fitted to your car.

Generally it was always felt that the air-conditioning of European cars wasn’t up to the task for Australia; that was because there wasn’t the demand for powerful A/C in Europe where the climate is generally milder. But when the European carmakers began to move on to the world market and export their cars to places like America where the demand for good A/C is very high they have improved the performance of the A/C systems in their cars. The cars you say have had good air are cars that are typically built for the US market, those you say don’t have good performance are not. A/C systems soak up quite a bit of engine power in driving the compressor and that has a greater impact on smaller engines than big ones, and again the cars you are critical of have smaller engines, so they will also probably run smaller compressors.