I want to fly jets (or big turbos) because you can get out of the worst weather (icing) more easily, you have wx radar and, if you have an engine failure, your departure is supposed to be gauranteed. Its not on a piston twin!
Icing and bad wx + not having the ability (due lack of pressurisation) to fly out of it is the main reason.
I heard someone say a while back...... "If you cant fly the fastest, fly the biggest!" It makes sense to me!