Agree with Mr.Watson.
I do respectfully disagree with breaking more birds with a 20ga vs 28ga however. My scores reflected what most skeet tourney show. The 28ga is the best gauge for most 4 gun shooters.
I know as a rule "matter of bore--not choke" but the 28 is unique in it's payload to bore. It performs better than it should, that short shot string hits hard and with great pattern density. The recoil is very little if any , even in the small frame guns. This is the Good, shooters are focused on targets knowing the recoil is not there and therefore no flinch, and they better follow through with swing. Anticipation of recoil causes a shooter to flinch, take face off gun, stop swing, not follow through...
The Bad is- most use is in skeet and unless one reloads or has deep pockets ammo selection is slim.
Citori, Rugers Red Label, Beretta O/U....28 ga used might be a thought...gun fit still should be determining factor.