The A&D boxlock is king. If I was told it was the only gun I could own, I wouldn't feel as bad about owning the A&D as I would feel about getting told I could only own the A&D. I've seen it printed that God himself shoots a pair of Purdey hammer guns, but, if God is a practical sort of guy, I'd bet he has at least one A&D boxlock, as a backup, or, for when it is raining. A nice, cased A&D.
The Beretta, above, is likely mostly an A&D, with an odd sidelever stuck on it. It might be ugly, but, being a Beretta, I'd bet it works.
I've adapted myself to several different designs of shotguns, some better than others. There isn't much to adapt to with the typical, toplever A&D, and, that is a very good thing.

Best,
Ted