Turboprops simply cost more: to buy, to own, to fly. They offer better performance, reliability, and lighter engine weight. They also scale up well. After the initial premium for switching to turbines, cost per seat starts to go down.
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Planes with turboprop engines are typically limited to a lower cruising altitude than jet engines, capping at around 25,000-30,000 feet. Because of this, turboprops are also more susceptible to turbulence, noise, and inclement weather.
When it comes to safety, jets and turboprops are essentially equivalent. Both types of aircraft are powered by turbine engines, making them virtually identical in terms of safety. In general, turbine engines are mechanically simple, light, reliable, and easy to operate.