Yes I agree with everything you've written billvann. The s2 is a good walking around tool the wave would be better in a survival situation.
And the surge - which you didn't mention - would be even better. Bigger, better blades, etc.
But I'm giving my surge away to someone who can use it in his work, since I never carry it. At 12 ounces, vs. 4 for the juice s2 and 8 for the wave, it's just not worth the extra weight.