>> but it's still the single versus twin argument !
Porterhouse
This is a meaningful argument if you compare single versus twin if engines are similar in performance and reliability, there is no comparison between a single turbine and twin pistons.
Not true, the single turbine relies on one HP fuel pump to sustain fuel to the engine when that fails the engine quits. Ask an owner who I occasionally flew around in a piston Malibu converted with a PT6 turbine called the Jetprop, FL240 over Switzerland exactly that happened when he was flying by himself and the engine failed it made a glide approach in to Geneva, after that within weeks he bought a Citation 501. It seems because they are powered by a turbine people think they never fail, however the turbine is far more reliable than any piston engine but not infallible.