Factory grip wise, I'd take the Redhawk over the Bisley Hunter. Since you want to hunt with it I'm assuming you are going to scope either? Single action wise, if built of like materials and quality, the single action will be a stronger gun than the double action.

If you are going to re-grip the Bisley then I might would lean towards it since you'll be shooting both "single action" when the moment of truth comes.
HL