It so much depends on what you do in your day to day. All the candidates have good things going for them, and you can't really make a mistake by choosing one over the other. I have or have had all the above, and all are awesome. That said, if you are going to spend much time in the boonies, simple+strong would be the logical choice. When it comes to strength, bigger is better, narrowing the field to ST 300 or Surge, which is also tough but has detachable (losable) parts. OTOH, for humping a lot of gear, you might be willing to make compromises for savings in weight (ounces really count!) For that, a Rebar could fill the bill (or even a Micra.) Your future military specialty could also be a factor. Infantry has different requirements than armor, for example. My service was before pliers-based multi-tools were invented, and I got along fine with just a plain old scout knife. However, I was a mechanic and had every tool known to man available either in the motor pool or shop vehicle when in the field, so all I really needed was something to open C-rations and all the other mundane stuff. My advice is get what you like now and if necessary, make adjustments later.