Ok, so looking back it was only 2 companies but 6 total knives: I had 5 SOGs (Seal Pup, Flash II, Trident, Aegis, Aegis Mini) and 1 Cold Steel (Recon 1 Tanto). Bear with me, I didn't have the good shopping habits I have now when I first got into knives, so SOG was the best as far as I was concerned. I used them mainly for EDC at a warehouse job, cutting up boxes/tape/paper/shrink-wrap/straps, basically whatever you'd find in a general warehouse. Cutting up boxes was where most of the chips seemed to come from, guess lateral rotation caused most of them but I know that only the Aegis Mini lasted more than a year before I got chips in the blade somewhere. I had factory edges for most of the time, or else my brother would sharpen them for me as he had a diamondstone sharpener and I was terrible at free-hand. The Seal pup was my outdoors knife, and only a couple trips in with simple wood prep work (no batoning though) and I had chips in the edge and a missing tip.
If there's one thing I remember from using all those knives, it's that the steel was annoying as it didn't stay sharp for as long as I wanted it to, and it also has the chips in it that caught on things and made it rougher to cut stuff like the shrink-wrap.