The correct answer always is and always will be 16ga.
There will always be that guy who weighs into the conversation , LoL.
I have humped an 870 up and down Mt. Maxwell on SaltSpring Island a few times (when I was young) ground sluiced chickens with a 410 or popped them from the branches.
The 870 28 gauge was just to light for my hands and the 1100 20 gauge modified choke has found its place in camp and on the stalk for those crazy chickens who have been educated by hunters before me.
I have not really given the Charles Daley SXS in 20 much time, but it looks promising.
Good Hunting and better Hunting in 2021.
Rob