Is a plain blade or a serrated blade better for self-defense? Or does it really make any difference? Most of my knives are general purpose utility folders that I use for a variety of tasks, but it is somewhat comforting to know that I could use them if necessary for self-defense. As a result I usually select the blade for the utility tasks rather than the hopefully never-to-be scenario where I would need it for self defense. Some friends have told me that a serrated blade is more effective than a plain blade for protection against either the two-legged or four-legged animal, while others prefer a plain blade. Which do you think is better?