This could almost be a trick question as there are'nt many of the companies left. I guess for me its a toss up between Case and Victorinox. Case for the long time they've been around, great customer service even on restoring an old peanut from the 1940's. A wonderful lady by the name of Shirley did okay by me when I had to deal with Case. Very personable. In this day and age of corporate parent companies, thats a rare thing.
I have an admiration for Victorinox for consistant Q.A., and keeping it in the face of production numbers that are staggering. They make more knives than anyone else, yet you almost never find a bad one. Maybe this has something to do with the company being in buisiness since 1890, but there is still an Elsner at the helm to this day. Its still in the family. The only other knife company that old and still a family run operation is Opinel. Also with Victorinox, I can be out someplace, and if need be I can replace a lost or damaged pocket knife at the next sporting goods store, and know it will be just like the last one. And a warrentee thats unreal.