As a pilot,
SkyWest and Horizon always are in the top regional airlines. They pay the best and overall treat their employees the best. Among the lower ranks would be Great Lakes, Mesa Air Group, Gulfstream Intl., and the now sorta-maybe-who knows defunct RegionsAir.
The likes of Comair, ASA, American Eagle, Mesaba, ExpressJet, PenAir, Commutair etc. are usually in the mid category of decent regions. Not too bad on the pay but not exactly the top end.
Trikes are for kids!