In straight knives, it used to be an old Kabar, which Clayton has now, but at present an early Cold Steel SRK. I dig weeds with it, open cans, throw it. It looks like hell, but will still take a good edge and keep on working.
As far as folders, all my Cold Steel - an XL Gunsite, a large Voyager Tanto, and an XL Voyager plain clip pt.