As slow as possible, as much drag as possible. Of course, ATC will not be too impressed if you have full flap and gear down but the angle will be unbeatable! Loss of angle in slowing up is more than compensated for by the resulting descent angle. Even better in a strong headwind.
If that 'slow' is not possible, do it as slowly as you can get away with and with as much drag as you can at that speed.
. Any EXCESS speed will make your overall angle worse as you lose the speed at the bottom - assuming you need to land!