They are both good. My own experience in Aus was of 1,000 hr command m/e piston single pilot IFR. I then went to Dash 8 F/O for 800 hr now Command for 1,200 hr on the -8. Lets be honest and say that I'd take what's ever available, but if you already have some piston command time, say 500 hr, I'd go for the multi-crew turbo-prop F/O job. I only did what I did because it happened that way!