Estate or Rio seems to be the best value in shotgun shells these days. Midway I believe is where I found Rio 20ga buck in 25 count boxes for cheap and they had birdshotIf this was a discussion about rifle ammo for hunting, I’d be much more concerned about a ”brand name”, but for target shotgun ammo, I don’t give a rat’s hairy butt whose name is on the box as long as it’s cheap and breaks clays.
I’ve got several cases of Noble I got a deal on a few years ago, and I’ve shot a ton of Rio over the years. You’re more likely to pay a premium if you try to stick with the old major names, but some people just like to stick with major brand names.