I don't know if there is a "best", probably several of them depending on experiences and personal preferences.
The Ruger Mark IIs hang in there, several models to choose from depending on personal preference. Stainless, blue, various barrel lengths, bull/standard/slab side barrels, two grip options (standard and .45style), fixed and excellent adjustable sights......
If there is a down side to the Rugers it's the reassembly. The first time or two you may teach the kids a few new words but it gets to be a piece of cake with experience. I have also had the displeasure of take down and reassemby with a Buckmark. It's somewhat on the unfriendly side the first time or two also, but otherwise, it's a pretty fine pistol and you find a few different options available.
It's a tough choice. Let us know what you settle on.