Most folks will say Chill Factor,but Power plant gets my vote,simply because of his ability to cross well with most anything,for making Clubbie Momma's.I like and have used Chill Factor in certain situations.He has been a great breeding bull. Since the past 20 years or so has been spent on helping folks develope club calf cows, I can say without reservation,Power Plant cows, bred to Full Throttle,dominated the show ring and pasture for a lot of years. Cross the Full Throttle/Powerplant cows on Heatseeker or Heat Wave and it speaks for itself.