I've never had a spoke break as I'm fairly light and prefer to ride on well built wheels (preferably built by myself), but I bring a spoke wrench just in case I hit something in the road or get hit by something/someone that knocks my wheel out of true enough to rub the brakes.

I had a goofy teammate fall into my rear wheel once which called for a truing on the fly. The only case I've had in 9 years but if I hadn't had a spoke wrench, I would have been walking home.

fwiw I just carry the standard black one. It's the one I built all of my wheels with.