You can grow the standard Moringa and cut it back to a stump, and it will grow back fast. PKM-1 is supposed to produce pods sooner, be a more compact tree, and have uniform pod size. I also read that it has a shorter life span, something like 3 years or so, but I would like to confirm that.
In some places Moringa is grown like a veggie crop, they plant the seed, and harvest the leaves after a few months. I planted a PKM-1 in the front yard, I should have direct planted the seed instead of transplanting because it got set back, but it is growing.