I'm leaning towards the GU, simply because of the carry method and because it's a smaller blade. I don't see the point in going with the 3.95" blade over the 2.5". I'd think I'd rather have a smaller more concealable blade OR the largest that I can legally carry (5.5").
If you have an issue concealing a GnS... A smaller knife isn't what you should be focused on. Just saying.
I have no experience with the GU... But my GNS hides quite nicely
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NPE situations, I prefer the smaller knife. The GU handle is also somewhat unconventional, so most people won't pick up what is there. Ultimately though, you're correct, it doesn't make much difference. My GU even made it through Canadian Customs when they tossed my truck and made me empty my pockets (camping knife). I doubt the GNS would have made it, but that's conjecture.