Having been employed in companies with both concepts, RJs, turboprop and larger 320/737, I think it depends more on the business model than on aircraft type.
Both RJ and turboprop are very similar in costs, and if you are the only one to operate a route, passenger can't do anything anyway. While there are a huge number of network carriers who operate small RJs and turboprop, there isn't any low cost who does.
Conclusion: it depends on the yield which type you can use. The higher the ticket price and the more C-class, the more RJs you can use. That's why lots of network carriers stop operating those nice CRJ-100 50 seaters, they are just too expensive. Bombardier halted prodution btw.
Regarding comfort I still think that every jet is superior to any prop. It's not only the noise, which can be handled with modern technology to a certain degree, it's also the vibration, specially in high speed. Additionally there is a higher complexity of the prop (gearbox, blades), which makes them less reliable and more difficult to handle.
Dani