A stupid comparison (Q400 > 747). Many 737/Airbus fleets fly as many sectors per day as the Q400 fleets with far less drama. Can't remember the last time a 737 wheel departed the airframe, but perhaps my recall isn't perfect...
I have no confidence in the Q400 whatsoever. Lightly built and under-engineered. Nobody wanted it until flybe ordered them, and for good reason. Everybody saw the issues that SAS had and kept well away - flybe only took it because it was fire-sale cheap.
Hated flying on it. Don't have to any more, than god.