I doubt from someone that actually autocrossed thier car or tried both and compared.
People say that because cars with 3.55 or higher gears almost always get that pump. So they ASSUME the pump is better for keeping up.
Sometimes the factory is not always right. For years people like LEE Manufacting who pioneered power steering in NASCAR, sport racers, and open wheel dirt cars used those type Saginaw pumps (currently there are other better OE pumps modified for performance apps)
At one time, LEE Manf. made pumps and power steering systems for Petty and nearly all NASCAR. Lee Manf. has/will do contract and R&D work for auto manufactures.