It might be hard trying to define best, as all the methods have plus and minus points. I don't usually top my autos as I'm very hesitant about slicing a time constrained plant (photos - no problem), but I have seen it done many times on this site with great success. I have no problem using LST however, as you're not removing anything & still triggering the same hormones that topping would. LST for me is the safer option, and still allows for great results. Normally the only topping I do is when the LST goes wrong as I'm stoned when doing it.