This thread is a wonder. Nylon, two types of poly, double braid, single
braid, twisted, and the reasons for picking a favorite, so varried.
Not the best, as the thread asks, but this is my poison of choice. Purchase
it locally at a farm store, because it is so handy. Not much for marine
stores in Nebraska. Double braid 5/8" UV resistant, rot
resistant, floats, polypropylene with a break strength of 3000 pounds, 300 pounds working load. USA made.
After a short season, and one full season, line is showing ZERO signs of fatigue or failure. Still looks new.
I tie my 4500 pound displacement
sailboat with four lines, and three 25 foot spring lines in a protected slip on a tiny lake. Doubt it will break free and make a run for it anytime soon.
Don't care for the look or feel of twisted dock lines. However, if my circumstances dictated it, I would use whatever lines were prudent to make sure my boat, and others boats around me, were safe and secure.
The white and blue design very well matches my sailboat.