My absolute favorite is the Spyderco Embassy I received as a gift with my call sign laser engraved on the blade. All involved in that treasure will always hold my deepest appreciation.
My favorite fixed blade is a Gerber Mark II. I've had a succession of three, two of which met bad ends over the years. I carried the first one through land survival training, then had one with me every time I flew. They never let me down.
: Advocate, Slysz Bowie Ti, Southard Black Blade, Stretch Carbon Fiber w/ZDP-189, Fluted Ti Native5, Terzuola Starmate, Terzuola SLIPIT, Leaf Storm, Gayle Bradley, Roadie, Chaparral CF, Chaparral Ti Stealth, Des Horn, Stretch FRN (Blue) ZDP-189, Centofante Memory, Military Black Blade CE, Delica4 FRN CE, Endura4 FRN Black Blade CE, Assist Orange FRN, Manbug ZDP-189, Ladybug 3 FRN SE, Delica4 Blue NLEOMF, Moran Drop Point BB, et al.
Spydie Fanatic #179