Ditto on what Ron has said and with same time experience. I started with Eskimos though and stuck with them for years. I chainsaw filed four serrations on the extreme back of the blade and stropped to razor sharp the entire blade. I have never questioned the effectiveness of that setup and agree that when its in the boiler room with smooth or serrated the animal is usually down quick. Funny thing though is that sometimes you hit back too far, foreward too far, down too low or up too high. As much as we like if we hunt enough we will get some marginal shots for various reasons.
Touching an artery with a serrated head could possibly make the difference between a wounded animal and a dead one. JMHO.
All this said this year I am hunting with the new Grizzly three blade and they are not serrated. LO
God bless, Steve