Typically a Spyderco Delica, for going on 2 decades.
Cold Steel Vaquero. Not exactly legal but never had any trouble carrying it in my jeans back pocket. I would claim it is needed in my work with horses, for cutting tangled ropes or a rider out of a stirrup if bucked off. Plus this is Texas, police have a lot more important things to worry about.
I used to carry a spyderco endura 4, but kept breaking the clips.
retired it.
I just carry a swiss army knife now. haha
Thinking about getting a cold steel espada though.