With 3 seasons on my 10S batteries I recently looked at 12S as an option as I needed to buy new batteries anyway. I considered weight, cost and performance. At the end of the day, I stayed with 10S as the only advantage I could see in my case was a slight increase in flight time. Since I will fly either Masters or FAI Silver in 2022, I do not require longer flight time. The cost of batteries were the same and a new motor ( Dualsky 180KV ) and Falcon 21x13 prop would have cost $275 US. I would have used the same OS 1100HV ESC.