Mainsheets - Dinghy mainsheets need to have low water absorption to keep the sheet light and free running - especially at mark roundings. A line that is easy and comfortable to hold on to is important as dinghy sheets are hand held and adjusted often.
Main and Jib Halyards - Dinghy main and jib halyards should be small diameter, hold well in cleats and have extremely low stretch.
Spinnaker Halyards - Slightly stiffer lines that run well for quick spinnaker take-downs are most desired.
Jib/Genoa Sheets - Dinghy jib sheets should be a line that is easy to hold on to as they are hand held and adjusted often.
Spinnaker Sheets - Low water absorption is important with spin sheets so that the lines remain lightweight keeping the spinnaker flying in lighter wind. They should be easy to hold and cleat.
Control Lines - Dinghy control lines should be low stretch and hold well in cleats.
Painter/Tow Line - A good dinghy bow line will be a line that floats and has a bit of stretch, often made of polypropylene.