I own a Buckmark camper in stainless. Nice grip, nice adjustable rear sight, really nice trigger, very accurate. Had it at the range the other day and could hit the 12" gong at 100 yards about 6/10 shots. As Caperbound stated the way the barrel is attached to the frame is a little strange. On mine the rear screw on the top piece behind the sight came loose at the range. I've tightened it down and might put some loctite on it (the blue kind, the red kind you need heat to loosen it if you want to undo it). I think the frame is aluminum (why I don't really like Beretta and Sigs). The screw under the bolt has some goop on it (similar to loctite?) so I'm just going to leave it and I don't need to take it out to clean it. It was my dad's and he gave it to me because his finger was too big for the trigger (it would pinch between the trigger and the trigger guard). So, I will never sell it and use it as it was intended: put as many rounds through it as I can. An excellent and cheap way to pistol train. This should be easy (aka cheap) with a .22. All guns will have some kind of quirk you don't like and they are all mechanical devices that have the potential to fail. It's how you deal with it that is important.
I also owned the Ruger Mark III hunter with the long fluted barrel. It was a nice gun. I should never have sold it. Trigger not as crisp, but still an amazing shooter and it looked good with the all stainless barrel, stainless frame and cocobolo grips. The grip is a little more blocky and the take-down a little more difficult. Don't listen to people that say it is a pain to field strip. Just follow the instructions and you'll be able to do it off by heart in no time. The Ruger has an internal lock that I don't really like (like newer S&W revolvers), but since it's a .22 it's not that much of a concern. Why would you want a gun that potentially might not shoot when you want it too if the internal lock were to engage? I think it only locks the safety in the 'on' position so probably not really that much of a concern. With the safety off I don't think it would engage. Just don't forget the key when you go to the range. The Ruger also had the option of a rail for optics. I'm not sure if you could adapt the Browning Camper for one? I think other Browning models you can put optics on. I've never felt the need to put a red-dot or other type of optic on mine so not a concern for me.
They are both really nice guns. Just buy the one that you like and that fits best. Fit is not as critical as a shotgun, but it helps.