Though I have been accused of being a collector (denial word for hoarder) of knives - just about all of mine are users and I gravitate towards function and value when selecting a knife. I also give consideration to the company and its customer service as well as, the person or people behind the knife like Ethan Becker, Sal Glesser and others.
In that context - and in no particular order.
Fixed
Becker Knives; The knives are great users - they perform and hold up. Ethan is great and Ka-Bar absolutely stands behind their products.
Ka-Bar; the company is run well by very knice people. Their knives provide very good value and they stand behind their products.
Buck; Long affiliation - since my youth. Knice deigns and a company that stands behind their products.
Cold Steel; I have certainly gotten my money's worth out of the Master Hunter, SRK and others. Not as ergonomic as the Beckers, but still good.
Folder
Cold Steel; Triad Lock - Boom! (Clips are too tight.) Unknown if the new owners stand behind CS products from the LT era ... or even the current era.
Buck; If you don't have and love a Buck 110, I question if you have a knife soul.
Spyderco
ZT
Honorable mentions that require footnotes
Busse. Tough knives. Interesting business model.
Microtech; I like many of their knives but the CS seems to be all but non-existent.
Benchmade; really not bad knives at all and the company ain't that bad but the Axis lock just doesn't fit my mission profile - too easy to get gunked up/debris contaminated and the whole affair relies on those dainty little Omega springs that are prone to failure.
Emerson; I have a bunch of their knives; too many in fact. Was a fan boy. I appreciate EE, his passion, views, conviction, patriotism ... but as for the knives - especially at their price point, I got to where when the bright lights, loud music and smoke machines are turned off I feel as though there's more sizzle than steak.
Kershaw; Again, from a value perspective - travel knife that if you forget it's in your pocket TSA keeps it ... they serve a purpose and some of them have done me well and continue to do me well for their price point. That there are reports of QC slipping of late does give me pause - but the ones that I own have provided value.
No knife conversation is complete without reference to CRK. Their knives are great - every one I have ever had does what it's supposed to do and very well I might add. The company is wonderful with really knice folks. Though I've had many, I'm down to but a few but use them less as losing a less expensive knife wouldn't bother me as much as losing a CRK. That I can buy two or three similarly functioning though not as prestigious knives to field dress critters, clean fish, split wood, make tinder/kindling and what not does not in the least take away from the quality, precision and performance of their knives. I guess you could say that while I am still loyal to CRK, I just find myself buying and using less of them. If cost were no object, I'd have every one they make along with a back-up.