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I would say topping plants produces more yield...in the space BUT it takes longer so over a year it does not produce more yield exactly.
If you top 1 cola the 2 colas are smaller...but they are not 50% of that 1 cola...they are like 75% of that cola...next top it diminishes...but again not at 50%.
At around 100 colas you start really hitting diminishing returns. I once got to 75 in a 5 square foot tent...trim jail style.
Easy to maintain is a round 4 to 8 colas. 2 to 4 tops and flower em.
if you have room for lateral branching. If not you dont top them so much.
Hope this helps
I do tend to ramble.