(and you don't have to be a pilot to need a small compact single weapon that can do a whole lot of stuff for you for weeks in the wilderness with unknown critters of the 2 and 4 legged variety.)
Somebody DID beat me to the punch with a side by side comparison here.
I just find the whole concept neato torpedo. They aren't much of a self-defense arm... You aren't going to fight off a platoon of Viet Cong guerrillas and NVA regulars after bailing out of your crippled F-8 Crusader with either weapon. But if you find yourself Gilliganed on a South Pacific Island and want to eat every now and then for a coupla weeks, either would be invaluable.
The Scout is just a small over under rifle still popular in Europe (see above), but with simple stamped metal stock. It sort of folds in half and reassembles with wingnuts or pins or somesuch. You can shoot .22LR and .410 or even .45 Colt put of the larger barrel (though you should probably stick to .410... no rifling methinks in that bigger barrel). Lately, people have been wrapping nylon parachute cord around the barrels as a hand guard and a source of survival cordage
The Henry only shoots .22LR, but it is lighter, and the whole thing fits inside the butt stock, making it even MORE compact once collapsed up. It is supposed to be water proof and float when collapsed or otherwise, but I've read that people have to seal it up with something to keep the water out of the cap at the butt.
Am I EVER going to be in a place, in this day and age, where I'd need something like this to survive? Most definitely not. Still, it might be a fun little item to have for just plinking. If you had a small cabin in the boonies you went to for camping and hunting and such you might be able to stash one of these out there. It'd be easier to hide than a regular rifle in the event of vandals breaking in when you weren't there. In a survival situation, after the Hottentots commenced their land invasion of the United States, if you showed up naked at your cabin you'd have SOMETHING.