As far as different shapes & styles... there's a couple considerations:
maximizing canopy area to fill growing space?
maximizing individual plant total yield?
It seems most of the indoor examples of pruning/training here(& elsewhere) are about the first idea but I've had good luck using the "super-crop" topping & "soma knuckles" bending/kinking/training to bring out a relatively bigger yield. I can't say it with certainty though because it wasn't done side-by-side to a clone allowed to be "natural" shape.
What I liked about the topping to 4 or 6 lower branches was the uniform bud size & flatter canopy. I think it will help me to do it this year since I had budrot last year, mostly on the biggest nicest colas(no airflow in the buds/colas), and the tallest plants.
The soma-bending or kinking makes a branch more horizontal, slows stretch, and gets light to the "lower" buds because they are no longer lower ... so it seems like less larf down low.
And as far as defoliating... I agree about leaving them be as much as possible...BUT I gotta hear this new info. (thanks @ReikoX). I saw some growers on youtube... "The Jungle Boyz" in LA, and the guy said he removes everything except the top 3 buds and any inward-facing fan leaf, at week 2 of flower. But that's for commercial efficiency, not desparate homegrowers!
I'm stoned. I'm outta here.