Get the Arc AAA. Both are marvelous flashlights. One will make your life complete--one you can live without.
The AAA is the one that will make your life complete. It's tiny and uses common, ordinary, stolen out of remote control AAA batteries. It will run for hours on dead batteries. It's small enough that you can and will carry it everywhere. It's indestructable. They've been frozen, stuck up 2-year old's noses (Or is it 2-year olds' anyone besides Kyra done it?). Theyre 100% waterproof--even if water gets into the battery compartment the light will continue to operate. Pick yourself up it, and a SS Clip from
www.berkeleypoint.com (You can also order the Arc from them) and never look back--you won't want to either.
The LS is fun to have but it is an experimental, no no, it is a growing product with some growing pains. Among other things--you might get one with a pea green emitter...this isn't Arcs fault, they do all they can to avoid this, but it can happen. They're not completely waterproof. They're just not perfected yet. You can't even buy them half the time.
If you can get both then do it. If you can only get one, however, get the AAA!