I have played around with this in the past, both systems have leans in opposite dirictions, THe one were you have -150 to win 100 and 66-100 on the dog, gives a lean that you will win more betting favorites, the one with -150-100 and 100-150 leans towards dogs. All depends on what you think you make more money on dogs or favorite.the one with 100-66 or 100-150 is a definite dog lean.All depends on what you winning % is betting favorites and Dogs.