I've never handled a Navajo. I have a large LUS, and I had a small Point Guard. (I sort of collect CRKTs)
I personally like the LUS far better than the PG. I gave away my small PG. At the time, it was easy to make that choice. The PG was the first CRKT knife I didn't really like.
The LUS has a smooth action. Mine came very sharp, good lockup. It is gray, not black, which has to be worth something. It is intended as both a utility knife and, if need be, to be serviceable in self defense. It is one of my favorites.
Today, when I checked, the Apache 3 at Smoky Mountain was out of stock. It had the combo edge. But, the Apache 2 was available @$25. It has much better grade steel and handle material than the 2 you asked about. It has ATS34 blade, and anodized aluminum handles. It is a little light for heavy work. IMHO, the Apache is second only to the KFF for self-defense purposes of the CRKT knives. All 4 Apaches I own came sharp as the dickens.
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