Surv-Tac if you plan to set traps for police in the wilderness near Hope, Washington, or the Black Bird for general outdoor use.
Just a little joke.. The Surv-Tac honestly looks like it would be good for absolutely nothing unless you want a knife to beat on. The SK5 in comparison is clearly designed for actual outdoor use.
But as the previous posters said, it depends what you plan to do with it.