Dinghy sailboat mainsheets require lines with low water absorption and low kink properties to keep the sheet light and free running - especially at mark roundings. These lines are often hand held and adjusted often so a line that is easy to hold on to and comfortable in hand is a must.
Dinghy jib sheets are hand held and adjusted often. Lightweight lines with low absorption and a comfortable grip are ideal.
Spinnaker sheets on dinghies should be low stretch and easy to hold and adjust by hand.