Yeah I see where u are coming from.
My experiment is to see if there is a difference between the 2.
Ive read alot that topping lst wont make a difference in yield and it has to do with genetics amount of light and all that.
I can understand your train of thought, but topping isn't all about increasing yield, it's about increasing the amount of light that gets to the bud sites, which helps in many ways
If you grow a tree, you'll have a larger main cola, but the lower buds will not get enough light and will be tiny and not very potent. Furthermore, you have a lot of (widthways) space that is being flooded with light with no buds in the way.
If you top, you will have more light getting to all bud sites, therefore making the side buds larger. You will also be making more of your available light.
Last year my friend did a grow and hurt his back halfway through. He couldn't top and prune like normal. The result was, that when we helped him harvest, 1/4 of his crop was worthless popcorn bud with very little THC. The poor little flowers hadn't had enough light to turn into strong, potent flowers.
So - by all means do your experiment, but understand what the benefits of topping vs leaving them are, and realise that the untopped one will not be making as much use of your electricity $$$ as your topped one.
Remember, the best thing about indoor growing is that it's NOT natural. In nature a plant doesn't normally have artificial nutrients added. In nature a plant doesn't cry out for sex so much that it produces heavy, resinous buds like one starved of males. The beauty is that *you* decide how the plant grows. You tell it what direction, how much food, how much light. Leaving it to nature will just leave you with a more disappointing crop. Sure, that main cola is gonna be huge, but when you've smoked that you will be sad.