Most outhauls of my experience are a casting with a clevis pin that goes through the tack grommet. The casting goes back and forth on a foot or so of track bolted to the boom and is moved via an internal wire or wire to rope halyard to a small winch on one side of the boom. I guess if yours is line to an internal sheave or an external shackle, and then to a winch or cleat or whatever, I would suggest something extra strong, low stretch and friction-resistant, like one of the Spectra/Dyneema lines.
I would also endorse the use of a strong shackle, just because it's easier if you remove the main for sewing or stowing than undoing, and then you can backsplice the Spectra at the shackle as it can be a permanent fixture. Get advice on this as these lines are "slippery" and need a long splice.
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