All kidding aside, what are your plans for the knife? That`s what will help you decide whether you need the 1/8" or 3/16". I`ve only done 2 Kepharts in 3/16", all the rest have been 1/8". Also, as Jake pointed out, the Kephart has a wider blade (1 1/4") versus the Hiker`s (1"). Another thing, the Kephart has a more "hand filling" design, if you have bigger hands, it just feels better.
John