Low stress training vs topping. Which is better?

Supercropping is your friend.

LST and supercrop is about all I do anymore

Both! I top and LST almost everything and have for a long time, also will crush some branches to bend them where they need to go. With all this I never have weak branches on my plants.

Most light to the most buds! The rougher training seems to cause some positive results that way.