Why is drum to disc called an upgrade?

[CaptRMW]

Mr. Lambert I will invite you to take a test ride with me. Be sure to fasten your seat belt or I will pile your butt up on the dash with my drum disc with semi-metallic shoes and pads on all four. Drums are fine with newly turned drums and new quality shoes but the stopping power diminishes at a fairly rapid rate compared to discs with miles driven. I have driven my share of miles with 4 wheel drums and I can tell you a panic stop at 70 miles per hour will likely make some skid marks but not on the asphalt.