I am all for topping, snapping, bending and tying down - personally the result is down to so many factors not just topped or untopped.
you couldrun a test with two starting seeds but then genetics come in to play..
some plants I have topped have turned out poor whilst the same plant untopped had good returns and vice versa with another plant
I remember running ScRogs years ago with photo plants - one plant per tent and they would always get more than 400g from a 400w HPS, would not have happened left alone - I tried many times but never got over 1gpw unless scrogged
with autos I find some love it others don’t, horses for courses - for me I tend to always push the ladies so bending and topping is part of the course - at the same time well timed LST can yield huge amounts of excellent solid nuggets - either way, I always play
below - both fully dried Autos, both were played with in different ways -
tThis plant was LST and heavy removal of fluff and my Lordy lord did she feed the five thousand
where as this one was topped and trained to give 8 long colas and that is what she did (lighter for scale)
many techniques and each to their own - as long as the end is result is what you are aiming for, happy days it is
Z