If you are certifying welders for fillet welding you could use either options.  Both will qualify for the same unlimited range.  The fillet size is not limited based on qualification.  If you use option #1 you need 1/2" plate, if you use option 2 you need 3/8" plate.  Qualification for fillet welding with either option limits the welder to 60 to 135 deg angle connections.