Monofilament line has stretch.
Fluorocarbon has less stretch and is stiffer, pound for pound. Can be shiny though.
Braided line is no stretch and thinnest pound for pound. It is also available in matt green, brown and camo. Green Berkeley is very thin, very strong and lasts years. It also tends to be the cheapest brand.
Not sure why anyone would use standard mono for tripwire these days.