.95 is best for residential lawns, weekly/bi weekly cuts.
we use .105 line in one of the bigger trimmers for anything thats in between manicured and way overgrown... .130 line in a 36cc Stihl FS130R for real heavy stuff... still not brush though.
Just realized they made .155 last week, saw it somewhere and was like damn!
anything less than good .95 is wasting time, .80 or whatever is too small and gets eaten through easy.
Ford Trucks, Simplicity machines, John Deeres, Ferris mowers, Stihl/Echo/Redmax handheld equip. lots of trailers