You cannot go wrong with either the #1 Semi or the #2 Semi. Way back when, I helped Gene design the #1 and I own the first one that he made. It is a spectacularly efficient knife for gutting/skinning whitetail deer. That being said, I also own a #2 (which I had nothing to do with designing) and it is perhaps the better working pattern. I regard the #1 as the more elegant of the two patterns. I recognize that this is extremely subjective, however. The #1 Semi is 6 3/8" while the #2 Semi is 6 5/8". Looking at them side by side the #2 looks obviously bigger and feels bigger in the hand. Both knives are perfect whitetail disassembly tools.
I have them in D2 and S30V and they are startlingly sharp. The handle material is Micarta and the colors are black, green, and red. The original #1 has stainless pins. Others have black and brass pins or mosaic pins. All look very fine. And, of course, both the #1 and #2 feel like an extension of your hand.
They work without thought.

RS