I think the Stockys stock is 2 to 2 1/2 inches wide at the forend
I do not believe you will notice any accuracy difference between the 20 and 26 inch barrel out to 300 yds
I do believe that the model 12 still has the side bolt release and the hog hunter has the bottom release
The bottom release requires more work when installing the action in an aftermarket stock
All that said, you can't go wrong with either of the models and they might surprise you how well they shoot in the factory stock

I am sure others will chime in with help
Good luck on your choice
Jack