Most LEO's that I have talked to prefer serrated blades because NOTHING cuts a seat belt faster and it is very common to need to cut someone free of a seat belt after a car crash. If you are dealing with a smoldering car ready to erupt in fire and a 9 month old baby in a car seat the seconds saved with a serrated blade really do matter.

That said I prefer a plain edge because I like to keep all of my blades "push sharp". My carry choices are a Delica 4 and a Dragonfly. As for Spyderco, a college photography professor turned me on to the brand and I've been carrying one for many many years. Have a hardware store in my town that carry's Spyderco and Benchmade and every time I go in there have to drag myself past that display case.