I almost decided to abandon this thread but since good people have replied I will chime in.
I am not one to worry which of the knives mentioned is tougher than a billy goats parts. I determine usefulness by how a knife stands up to normal country boy/ outdoorsman actions. I don't intend to carry one of the above knives to rescue someone from being locked in a safe. Any of those mentioned will last a good spell if tended to a little, sharped NOT by a grinder, oiled in their joints, lint picked out of the blade well once a year or so and not using the tip of the clip blade as a screwdriver. I found a Buck 309 10 years ago in the middle of a western Kansas gravel county road. And even though no houses were in sight for as far as I could see in that flatland, it had been run over at least once. The back scale and liner was slightly bowed into the blade well, I bent it back farily straight with a screwdriver blade and the little two blade worked fine. Sorta like myself, we can get most jobs done but we have a couple of scars here and there.
Throw me out on one of the naked island TV shows, and I will be happy to have any of the three knives mentioned. Along with some bug juice. I have destroyed a couple of Buck folders in writing about their construction I will include a photo or two for your edification. 300
Looks solid to me. view thru bolster and blade pin.
This how tough is it deal is actually about money. If I paid a couple of hundred dollars for a folder then it better be well made and have some fancy fixin's on it. Jackknife would likely call it the Judge's knife. He stopped in the store while he was bird huntin' and was showing off his 'fancy' knife. Any of the knives mentioned above are made as strong as cost will allow but the cost is trying to be low enough so a kid can collect cans a good spell and go to the hardware store and buy their product. I think a bunch of knives here on Traditional forum are great knives and I would love to find one in the dirt of a crossroads someplace. But, I place value on the fact that any of them, well taken care of, will someday be owned by a person who will say 'this was his knife." Now that's a pocket knife.