- Between KSO Trek and Trek Sport, I think the KSO Trek gives you more bang for your buck. Why? Well it pretty much boils down to the kangaroo leather upper which is:
a) pretty dang durable
c) is less likely to snag/rip/tear/whatever on trails
The problem here is this: the coconut fabric isn't going to hold up as well on trails as leather, and that's really the whole point of a trail shoe, right? Needs to be up to the task of trails. That said, I'm not saying you'll rip your TrekSports out running or hiking in the woods, but it's way more probably (purely my opinion) than with the KSO Treks.
That said, $125 is a lot to fork over for a pair of shoes -- but so is $100. Why not just go with KSO?
The extra grip and foot sole protection against pointy rocks of the Trek soles is $15 worth. KSO soles are very slippery on dusty rocks or loose pebbles when sloping down hills.
Trek's upper leather may be very resistant, but not so the threads that hold leather and fabric pieces together. After a few runs one of the seams burst by just tension generated by the pressure of the foot against the vamps. In contrast, TrekSport seams look sturdier. On the other hand I don't think of the coconut fabric to be easy to tear. In any case I've never torn even the weakest sneaker vamps running on trails. Chances that can cause a tear are infrequent, on the contrary, a sole with poor grip is something you are probably going to notice as soon as the terrain becomes a little more technical (i.e., more slippery and steeper).