Originally Posted by MastUndSchotbruch
I had the same reaction. The weakest 'link' is whatever fits through your chocks, and there is no point wrangling a thicker line outside it. It will not make a difference in strength of the whole line (which will break at the weakest link) and just contribute aggravation.
The exception would be if you would go to the extreme of using a steel cable or some of the modern high-tech lines through the chocks but this is not what you were asking about.
Plus most of the high tech lines have little to no stretch, not comfortable for a mooring line and more likely to snap the cleat off as there is no shock absorption. I think the best is single braid nylon (ie New England ropes mega braid), so you have some stretch and strength, or plait line all they way.