Actually 1..5 just for your information....I am probably the biggest sceptic of SE IFR ops on this forum....the difference is...IVE DONE THE RESEARCH....and rather than sit back and take a pious viewpoint that all things being equal 2 is better than 1..I am prepared to be open minded. My personal viewpoint is that SE turbine A/C are perfectly fine for Air freight, or any number of aerial work type scenarios,as a matter of mindset it is still my PERSONAL preference that I would travel with my family on a twin engined aircraft. However I am able to deduce the facts..and they are not in dispute...single engine turbine A/C are by a factor of 10(or more depending on where you get the information from) less likely to be involved in a fatal accident, in comparison to a piston twin...there is no arguement.
Do the research..its all there.
H