I'm far from an expert in SD blades...but, as an avid outdoorsman, I've been hunting/camping/fishing all my life and I've carried folders and fixed.
I prefer fixed for my outdoors stuff. It's pretty much one handed grab and use and return. But, many folders can be easily opend one handed as well. Folders are probably more comfortable for everyday carry too...at least more "practical" as their more compact size doesn't get in the way of everyday movement as much.
For me, it's about the edge, comfor and balance, because, when I'm using it, I use it ALOT!
Good grip wet, dry, even slimy(such as mud) is key. I'd imagine the last thing you'd want in any SD situation is to lose your grip. If for no other reason than, with a quality edge, that's how people, the wrong people, get cut. That also falls into balance, as a well balanced blade just seems to work as an extension of your hand. If it's unbalanced, that can get you hurt as well.
Edge rentention is also important, and that falls into the metal quality and how it's sharpened. I don't claim to be a superior craftsman with an edge, but, once I manage to get a good one, I like to keep it.
The rest of the folks here have some great information regarding translating "good knife" qualities in regard to SD. But, I'd imagine that the same applies..if you wouldn't use it camping or take it fishing, it's definitely no good for SD.
And price isn't always a good factor..one of the best camping/outdoor knives I have only cost $50 , was a gift to me, it is a Frost, which, I always thought was more of a cheap decorative almost novelty blade..been using it for almost 20 years now..keeps a decent edge most the summer. The worst one cost almost $200...sits in a drawer.