Turbo-props are busier to fly, but things happen a lot faster in the jet. Some folks who do fine in props cannot manage to qualify in glass jets (usually older folks, as an experienced CFI I can say with certainty that younger people do have a learning advantage).

Plenty of turboprop guys get hired by majors. The majors do like to see the glass jet ticket punched because it gives them a warm-fuzzy that you can pass training on a bus, but 121 turbine PIC of any sort is far more important.