I carried Kershaw for about 12 years
Started with a Scallion, sent it in for warranty twice on the assist spring, still have it, still a good knife, but I moved to a straight edge from the combo. It is a good medium sized knife, good pocket carry, easy interface.
Then I went to a Kershaw chive. I lost about three of these. Still a very good knife, feels markedly smaller than the Scallion.
Then I picked up a SOG TOPO Meridian off Woot.com and carried it for about a month. I didn't care for this knife at all. The clip stuck out more than the Kershaws and would scratch the leather in my car, and the locking mechanism could easily be overcome, allowing the blade to close when "locked" open. I sent it back to SOG due to the lock failure.
SOG sent me a new Tanto Twitch XL in lieu of my TOPO. I carried this one for about a month and just couldn't get used to the lock back. What I liked so much about the Kershaws was the open handed open/close. I could not find an easy way to close this knife with one hand. It also suffered the same clip issue as the TOPO where it would scratch the leather on my car seat. Also, the blade lock is on the back of the knife and not as easy to use as the Kershaw.
From here, I went to a Kershaw Leek. It is about the same size as the Tanto, but the blade profile is not as robust. I found it to be an exceptional EDC design for an office environment. I carried this one for three years. The only issue I had with my Leeks was the blade was more fragile. I sent one knife back to Kershaw and they replaced the blade for $10. Also, the cheapest Leeks are about 60-70% of the thickness(laying flat) of the colored ones.
I happened upon a deal on Amazon for the Kershaw Blur. It is much beefier than the leek and I figured I would give it a shot. I read several people complaining that the texturing causing excess wear on the pants pocket, though I did not carry it long enough for it to be an issue. Though this is still an open assist knife, there is no flipper, only a thumb stud. I never cared for thumb studs, and ultimately that was why I moved on.
Woot had another deal going for a snapon brand CRKT wrinkle. I had always heard CRKT thrown around as a dependable knife, so I gave it a shot. This is not an assisted open knife, though the ball bearing pivot makes it almost not needed, almost. You can press the flipper fast enough in almost any position to fully open the knife, but I felt it was more effort than I ought to apply to open a knife. It is also the ugliest knife I have ever held, though the grip is not uncomfortable and the ergonomics are still quite good.
After going back to the leek for a few months, I discovered that automatic knives are legal in Florida. I decided I needed to get something Made in the USA, and landed on Benchmade. I searched around and always ended up comparing everything to my Leek that I enjoyed so much. I found the Benchmade Mini-Reflex 2550BK. The look and feel of this knife is great. It is a bit thicker than the Leek in the handle, but the blade is much more stout. I found this to carry nicely. My only complaint is that the button that operates it is a little gritty(that is being extremely picky).
Finally, a guy on my local gun forum was selling a "slightly used" Benchmade 5500BK Mini Presidio for a reasonable price. Knowing the quality of my Mini-Reflex, I snatched it up. The thickness laying flat is comparable to the Mini-Reflex, but the width is about 15% more. The textured grip is a nice touch, the handle fits well in my hand, and the action mechanism and lockup are terrific. I've been carrying it now for about two months. When I got it, "slightly used" meant abused edge with nicks, finish coming off the handle, and obvious abrasions from being dropped. I managed to sharpen it to my liking in about 20 minutes. I may go back to the Mini-Reflex, but can't say for sure right now.
I profile all of my knives with a double edge, 15* and 20* respectively. I use a Lansky diamond kit with a sapphire finishing stone.
Ultimately, I think the Leek is my favorite EDC overall. The ease of use for one hand, the warranty support from the company, the profile/size of the handle. It is also the fastest opener I've had. The only downside is the lack of thickness in the blade. It also costs about 1/3 of the Benchmade, but then it isn't made in America. For now, I'm sticking with the Mini-Presidio. Most of the other knives have found their way to common use locations(CRKT in my van, SOG in the SUV, Blur in the laundry room for opening dogfood bags, Leek in the kitchen for opening mail). A few have ended up in a drawer(scalloin, chives).