4" dovetail for me, as I don't like the sight extended past the limb pockets on a mountain hunting bow, but like the dovetail design for sight removal and positive return to zero. Good luck!
Same for me, 4" dovetail. Allows you to fit the housing to peep diameter, and easily remove the sight if needed. The Black Gold dovetails have very user-friendly settings for the dovetail mount too.