What I carry is a vintage Gerber Harsey AirFrame. Actually I have two of them. I have a First Production Run (with the titanium scales) that is my EDC, and a later limited edition (with the aluminium scales) that I carry only on special occasions (formal events), because it's substantially lighter, and that makes it easier to clip to my lingerie comfortably.
But, the first knife I recommend to everyone is the Ontario RAT II. It's cheap, well made, and is one of the only knives on the market with the option of mounting the pocket clip four different ways. The only thing that could make it better is if there were a true left-handed version.
There's probably nothing you need a folding, locking knife to do that a RAT II can't do, except impress knife collectors, LOL.
What's the best knife for *you*? That depends in large part on what you want to cut, where, when, and how you need to carry it, and how much you need a knife to stroke your ego for you.