If I could only have one outdoor knife to handle all my hunting, fishing and camping chores, I'd make it from one of the stainless steels in CPM-154, Elmax, S35N or CTS-XHP. I haven't used the last two, but I've talked and read to a few top notch makers who are impressed with those steel. I do have knives in CPM-154 and S35N and I like both of those. But of course, I love my carbon steel knives and know how to take care of them to keep them from rusting to bits.
I'd also have Micarta or G10 scales on them. Remember, I'm talkin' if I could only have one knife. I like stabilized handles, as well as tough woods like Ironwood, Cocobolo and Bocote (to name a few), but if we're talkin' only one knife for the rest of my life, give me Micarta or G10.