I first learned the blind judge, and after the 313.
But I have to recognize that it was harder the blind judge, but may be it only was harder because the hardest part was to know how to handel pass in the air, and once you have it, it is exactly the same hp in the 313 at the opposite direction, you have only to learn how to edge hard (pop) in the switch side.
But it was easier for me the 313, yes