Serrated blades are a gift of the food industry. Serrations seem to last longer because a portion of the edge is always lifted from hard surfaces ( bone, cutting board, dinnerplate.) What you have is a tearing instrument like the canine tooth. A plain blade is a shearing tool, like the incisors If you have a hammer pommel you even carry molars. Personally , I've found serrations popular with rope cutters; sailors and horsemen who may have to part company with a towline or leadrope. What I found doing both, is half these folks can't select or maintain the proper plain blade to accomplish either.