FWIW and not exactly on topic, one of the best, if not THE best, reasons to own an OU shotgun is that it will be one of the very last firearm actions to be prohibited in whatever you want to call this nation and whatever you want to call its system of government. As far as I can tell, there is still a large number of people who own OUs for clay shooting and even bird hunting. Our overlords like Nathalie, Mark and Gary are going to have an extremely difficult time brainwashing even the gun haters into believing that these are firearms that are designed to kill people on a battlefield, soccer field or Main Street.
Also, OUs are pretty versatile when it comes to ammo. For a 12-ga, you can even buy barrel inserts that will allow you to shoot rifle caliber ammo from 22LR and magnum upwards. (I feel that single-shot break-action and bolt action rifles are also relatively safe from prohibition, but if there is a mass-killing by a person using a firearm with those actions, who can predict how long firearms with those actions are not going to be prohibited.)