Use something that is strong enough and easy on the hands.
All the high tech lines like Dyneema and Spectra are fantastic materials but they have a place - on high performance boats. If you are racing and worry about your boat speed in tenths of a knot, then they're probably justifiable.
Really, think about all the applications and whether you will notice a difference using them on your boat and weigh that up against the cost.
I know that my boat will not be equipped with these lines. SD's table from Cajun look like the right stuff for me.
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