I'm not sure which is best. If I go with the MB fittings with the brazed on -10AN fittings I'll need to shorten the hose... but no problem, since the hose ends are by design reusable.
The oil cooler on the left is stock and the one on the right has been drilled and tapped to accept NPT fittings.
One consideration might be that by using the elbow fitting with the modified oil cooler there is a lot less leverage on the radiator connection and less potential for fatigue or breakage.