Well,...dont be disgruntled if you wind up with a small box of different blades. As most have alluded to, a lot about EDC's are "Feel". What serves YOUR purpose, what feels good in YOUR hand, what opens well for YOU. You'll probably have to play with a few in actual use. Definately handle as many as possible before you buy. That'll eliminate a lot.
I've used expensive ($500ish) EDC's but i've been afraid to use them for things i'd use my $50 blades for. I sold them. They were of no benefit if you are afraid you might scratch or break them.
If i'm not in the urban areas i prefer a fixed blade. But fixed blades scare sheeple and widen the eyes of some law enforcement.
Strictly self defense is different then a work tool.
Do you have any martial arts training?
Karambits are great EDC's if you've worked with them.
Most recently i've been carrying a 5.11 Double Duty Karambit and it does everything i want, it's very well made, and can be had for about $70.
Try a variety.