You will get diehard 20 ga fans that will swear to their 20.
I find the recoil to be about the same.
The cost of the shells is the same price.
With 12 ga you get more shot, more powder but the same velocity for the shot and range.
There is more shot out to catch the doves or what ever.
Did you get the "cost of shells is the same".
I have seen people with the 20 ga has less recoil for women BS.
My wife will only shoot 12 ga and has had no problem with the recoil.