In my opinion, Hotchkis is designed by guys who design, build, and race cars in a number of road race classes that are relevent to how these cars are/can be used. They engineered their product to overcome inherent issues with the original design and improve the road holding capability and the driving experience.
By comparison, Magnumforce has designed lightweight products for drag racers that utilize components that mount in places supporting weight in manners the uni-body was never designed to do, and utilized stock mounting points for a number of pick up points, ie, their engineering is less than optimal.