It would be an excellent thing to see some 60-0 stopping distance figures on these cars, differently configured.
I doubt there would be a difference...but I don't know...I think I have made one panic stop in nearly a million miles of driving...to miss a deer..
My cars all have disc brakes including my yet to arrive JPS...but if they didn't I wouldn't worry about it.
If you drive with adequate sight and stopping distance drum brakes should be fine.
I am no expert but I am a old motorcycle rider and know the necessity of driving defensively and keeping your vehicle in tip top shape.