I flew in all 3 with Dan Air, Misc and BAF. I'm not able to give a comparison as these flights were spread over the years and perceptions varied. The 748 felt very 'solid' and gave a nice ride, the Herald perhaps less so and the F27 was always a pleasure to fly in. When I think back I flew on loads of regional airliners over the years and the F27 always gave a solid performance and a nice experience within it's class.