In my limited experience, the frame finish on current production 442's holds up better than the frame finish on current production 642's. Since I am a big fan of long term durability, I go with solid stainless 95% of the time and carry a 640, unless I positively must have the lighter 442 for specific summer wardrobe reasons. The solid stainless lasts practically forever, and you can use all the hoppe's you want. I know it wasn't listed in the three choices, but it's true, nonetheless.