Most guys use mono with their inline boards because that holds better in the releases than braid.But you can make braid hold with certain releases or wrapping the line around the release.Alot of guys use 10# test because that diameter line is what most the dive charts are based on.A higher pound test mono will hold even better in release and less likely to break.But the thicker diameter line will run your lures slightly higher in water column.We run Maxima ultra green mono in 15# test.Some guys use hi vis mono too.Says catch rate the same but can see line better when netting and making sure line doesn't fall behind a board when making turns.