Hey, everyone...
The OP is confused and sent up a major flare, and y'alls missed it!!
I hear:
Reliability will be equal. Fit should be your deciding factor.
[SIZE=+1]What do you mean by fit?[/SIZE] [SIZE=-2](emphasis added)[/SIZE]
In the simpest terms, shotgun makers generally make their stocks with one-size-fits-all dimensions. Just like trousers come in many sizes and cars and trucks come with adjustable seats, in the real world people come in all shapes and sizes. Different sized folks are best served by different sized gun stocks. Remington's idea of the average shooter's size may not be the same as Winchester's.
When mounting new shotguns for the first time, you'll hear folks say how good one feels. What they actually mean is that the gun is closer to their "size" than the previous one. It has nothing to do with the value of the gun, but what the maker gussed about their end user size.
Getting a gun to fit properly is easier these days because the gun makers provide shims and other adjustments. In the past, your options were limited to adding, removing or bending the existing stock materials. The reason there are some many different sized recoil pads on the market is because people are first looking to change the length of pull (without messing up the wood) when fitting a new gun.
With the Beretta and the Benelli there are two things in common: They both come from the same area in Italy, so originally they were sizing their guns to the same population. (Remember, Beretta has been making firearms for almost 500 years, so they have a pretty good idea of what size stock best suits the average Italian.) And, recognizing that we're not all similarly sized Italians, Beretta and Benelli provide stock adjustments for their over-the-counter guns.
I think common sense tells us where we're more likely to get help finding a proper fitting stock when comparing a big-box discount store to a real guns only shop.