What to do, What to do, What to do.

I am growing w/w for the first time which is I think is 40/60 indica, sativa. That puts it sativa dominate.

The issue I have now is my plants are at the point that you top but only 3" to 4" tall with maybe a quarter inch between nodes. Should I wait till they are a little bigger or top them now?

Also what is the differance in yeild doing it your style? Luckly I have twice the space as you so I won't have to thin the flock as much.