I buy a lot of Spyderco. My next favorites are Cold Steel, Victorinox, and David Mary.
I have a lot of M4 that I use, and Cruwear. I really regret not uhhhh, saving my 20CV Yojimbo because I know Microtech runs the M390 a tad below potential and I am very confident in the Spydie treat.
I do not have huge problems with rusting, only in sheaths. Rusted a Vic Executive and a Spydie Dodo in M4 in my pocket protector of leather. Rusted both Cruwear and S45 PM2s overnight in a sheath. Cruwear is pretty stainless. I love the balance.
I just don't have big rust problems. k390 patinas like heck in my pocket all the way to gray but no issues. I like that it is generally easier to sharpen, the tool steels, and tougher. Love my serrated Police 4 and Dragonfly Wharnie in K390.
I am afraid 3V is good but overrated. Sold my SRK in 3V for a Benchmade Puukko in 3V and it just feels more right on the knife.
I do like 12c, 14c, AUS10A, AEB-l, Inox and good old 420HC.. I don't mind simple stainless as long as it's all good. Hate Trusharp. I just want a promise of a good treat so I go with custom makers and Spyderco a lot, or other companies that nailed the steel they work with.
I am absolutely interested in finding out about some low-cost brands that do good stainless. Maybe Euro or South American? Does Joker not use a good 14c28n? What about those big old Mikov switchblades and the fish knives?