I like to top for four, let them grow a bit then tie them toward the opposite ends of the pot, exposing all the lower nodes. Then a week later top everything that is at a set height. From then I just top something that is getting ahead of the rest. Normally that would be a lower node that wasn't big enough to top on the last pass.
When just topping I find that you end up with a taller V shaped plant, it's good if you were running say 6 plants in a 4x4. With a little lst it gives a wider plant, it works well if you are trying to fill a 4x4 canopy with 4 plants. Both ways play equally well if you put a scrog net over at the right time. It will control some stretch, while filling out the canopy, but the best part is an easy way of bud support. Beats the shit out of tying things up.
