Everyone that really wants to shoot a shotgun well should be fitted by a good fitter.
I'm 6'-4" and left-handed and was able to fit a Benelli Ultralight perfectly using the shim kit that came with the shotgun.
I think the difference in recoil between gas and recoil operated is negligible and mostly caused by the weight difference - recoil operated is always lighter. The lightweight of the Benelli is the attraction for me, and the simplicity is a welcome bonus. The shotgun can be taken down to parts in less than a minute.
