You are looking at 2 different things, at least you should be! First is accuracy, You need to be able to hit your point of aim with little deviation, If you cant hold a group, they you should NOT be in the field hunting whether it's the gun or you. Then and this is just as important and sometimes more, What happens the moment the "Slug" touches the deer. If the slug does not do it's job the deer will need to tracked and found on a less then perfect shot.
Like the Duke said, If everything works and all your deer are recovered, why change? Well because you can.
I own 3 H&R 20 gauges and they all shoot very well with just about anything that is thrown down the tube, AccuTips are a tad more accurate, however Lightfields are my choice for stopping power. There are people that don't like the round do to the fact that 80% of the slugs do NOT exit the deer even though the deer does not go 5 yards.
The best groups for me were the Hastings Lazer's.