I don't like the idea of carry a dedicated self defense knife along with your EDC. If you need two work knives (say plain edge and serratd,) so be it. The legal issues aren't worth it to me. While it's not illegal to carry for self defense, a district attorney well eat you alive for carrying for those purposes only. For me, I carry one EDC. It gets used, sharpened and maintained. If I don't have time to get to it for sharpening, I will switch EDCs until I can get to it. My EDCs have handling and using marks on them. If they should find thier way into court, they have obviously been used for taking care of multiple cutting tasks. Also, it's a learned reaction (habit) to reach for that EDC, draw it, and open it one handed without hesitation. I draw and use it daily, so I don't have to think about it. Like the person who stated earlier the always reach for their other knives and forget their self defense knife is even there. That's not good. I want to KNOW my knife is there and exactly where it is. In terms of EDC carry, I choose a knife with quality materials, great fit and finish, strong lock up, and a good practical blade geometry and size for cutting tasks. Ironically, I look for the same thing in a self defense piece. That is why I let my EDC double as my self defense knife. With one knife, I don't have to justify to a jury why I am carrying 3-4 or 8 knives. I have one, that shows obvious signs of being used for daily cutting tasks,that is a tool first and foremost and was used as a last ditch self defense tool when the need arised.
JR