Yellow Jacket, or Southwire. Don't look any further. I'm a tradesman and that is all that really holds up. I have a 100' YJ 14awg that is 15 years old, I amazingly flexible and still like new after many years of use, dragging, coiling etc.
I can confirm that Yellow Jacket extension cords were the cord of choice for running under data center floors by shady internet service providers in the late 90s.