On the subject of folders, in one of his video's, Ron Hood mentioned one of the Victorinox Swiss Army locking knives (the 111mm format) such as the Outrider or the Trekker because of the saw and other tools that can come in handy.

Doug Ritter's RSK Mk 1 is a folder. IMO folders make good survival knives because you can carry them just about anywhere and will have them when you arrive at that unexpected survival situation. If it's not unexpected, you won't be there.

There are many good knives for hunting, I s'pose the best depends on what you are hunting; the best for Quail ain't the same as the best for Elk. Check out the Dozier website for his line of hunting knives. D2 steel makes a good steel for this because it holds an excellent edge.

If you want a fighting knife then the Marine Kabar is as good as most, most of what makes a fighting knife good is the skill of the guy whose hands are holding it.