Each company will have its fans and detractors, but I have owned knifes from many manufacturers and here are just my personal opinions on what I happen to own in general...
Benchmade... Love their product and rate as one of my top 3 faves overall.
Chris Reeve... Lg Regular Sebenza. Along with BM 805, it's one of my favorite EDC's.
Victorinox... 'Nuff said.
Spyderco... Great knives, my fave for all-around use is Endura.
Al Mar...Only own a SERE 2k and handled others. My SERE has ball detent issues, but fit/finish otherwise excellent. Overall, IMHO, quality at various levels seems about on a par with Spyderco.
CRKT...Haven't bought any for quite a while. They make a good product for the $.
Leatherman...my fave pliers multi-tools, esp, Blast and Wave.
SOG...some good folders, but they really excel at fixed blades.
Cold Steel...Their Voyager models are a great buy, IMO the clip point is more versatile.
Camillus...own an EDC and several traditional slipjoints. Overall, good quality.
Buck...Some of their stuff is outstanding (110, 112, 503); IMO some not as consistent.
Kershaw...I have some of the Liner Action models that are kind of a sleeper among knives; several Speedsafes like Blackout, Leek, etc., well-done.
Pro-Tech...Own a Runt (California Legal auto)...top quality.
DKD...Another CA legal, the Sharkstooth...equal to the Pro-tech.
Emerson...CQC7-A and B, Commander, La Griffe. Overall, I like the quality of what I have, but don't use very often.
These are just some of my own perspectives on some of the manufacturers whose knives I happen to own, and YMMV.
Jim