The "Premium" red ones are intended for use on a lift where the car stay level as it goes up. If you are using a floor jack to lift one corner/side at a time, the car goes up in an angle and the extra width of the "Universal" pads allows the pinch weld to rotate within the pads instead of bending.
So Universal for floor jack or lift. Premium for lift only.
This was posted by ZL1addons to explain the "loose" fitting rails.