I am somewhere north of 300 knives, everything from 2 for a dollar to $1000+. Pocket knives, sheath knives, swords, machetes, switch blades, gravity knives, etc. Oh, and kukris, tomahawks and axes.
Which one would I pick? Without a doubt, my Randal Model 14 Attack.
But how about a longer answer? I carry a SAK every day. And a Gerber Applegate Covert Auto. Sometimes I add a Leatherman Original.
If I'm going out to the farm, I usually add my BlindHorse Knives Bushcrafter. It is a very non-threatening knife and incredibly useful.
Always in my truck are a Gerber Prodigy, a spare SAK and spare multi-tool, along with 3 days worth of food and water, dust masks, fire making kit, cook set, 2 compasses, a GPS, topo maps of my state, binoculars, carabiners, a rescue pulley, 100' of 1/2" climbing rope, an axe, and a bowsaw.
My wander around in the woods kit is a 32oz Pathfinder Bottle kit, in a molle compatible bag with a shoulder strap. Another Gerber Prodigy is attached to it and the bag holds an alcohol stove, cup/cook pot w/lid, spork, 3 ways to make fire, and a small bag with hot choclate, tea, and 2 types of bouillon.
My zombie apocalypse vest has a Gerber LMF2 attached, along with a Glock 22, 5 extra Glock mags, 6 extra MagPul 30 mags for the CAR, a tritium compass, 2 GI canteens w/cups and lids and an angle head flash light.
My Boy Scouting rig is a large 2 bladed Case Scout knife, with a SAK in my pocket.
Bored yet?
My hunting rig is either a walnut handled Buck Vanguard or Schrade sharp finger "Little Finger". And always my SAK.
When I used to go to Rendezvous I carried a Ken Richardson Large Bowie and a KR patch knife. My tomahawk I made myself and my throwing knife was a Gemmer Beavertail.
Did I mention the Bayonets?
Oh, and I also collect compasses.