Why limit yourself to only 24" or 26", the great Robert Churchill horrified Victorian society by putting 25" tubes on his "best" grade double sxs. He had a lot of good reasons for doing it, and it was positively against the norm of the time, which was 30" and 32" barrels. Let me tell you, a 25" barrel on an english doublegun is really compact! ! I own a few, and alot of 26". Have a few 30" and 32" as well. Except for targets, I have noi idea why anyone would lug a 30" cannon across the uplands these days. But in the end it's all what you shoot the most often and I guarantee, it will be the one you shoot best with. Moral of the story, pick what you fancy, shoot the heck out of it, get good and enjoy! I guarantee a couple of inches isn't going to make a difference.