Every day that I work there now is a fixed blade knife that is very quick to reach. I've tried several; the Ka-Bar TDI, the Cold Steel push knife with the wicked blade and T-handle... okay but just not right for me. I paid both of them forward to friends for them to try out (hopefully successfully).
I sprung a lot more money for an ESEE-3 with linen micarta handles. I just love it and have carried it non-stop for over a year. It does EVERYTHING I need it to do in the field. There is a folder in my calf pouch, which is a CRKT M21-04 big and strong but too slow if I really really want a knife and want it NOW. IMO a fixed blade makes a lot more sense.
Around town if i can partially conceal it I just tote a Gerber fixed blade with a drop point in a cordura belt sheath.