I think it's a speed and height thing - horses for courses.
Turbofan engines are essentially gas turbine-driven ducted fans, with almost all of the thrust being produced by the fan, comparatively little by the residual thrust from the gas turbine. They are more efficient at the sort of speeds and heights jet transports fly at - higher and faster than prop aircraft.
Turboprop engines are a gas turbine-driven propellor, with almost all of the thrust being produced by the prop, very little by the residual thrust from the gas turbine. They are more efficient at the sort of speeds and heights fast light aircraft or small commuter airlines fly at - lower and slower than fan aircraft.
SSD