I prefer reflectors, usually not gold unless I want it to look artifically warm. I like refectors because I think they look more natural than an on-camera fill flash, but they can require slower shutter speeds or wider f-stops than what you can get with flash. Also, the models can tend to squint more, and you need a strong assistant to hold it in the wind.
Since exposure is critical (to those of us raised on, and still shooting chromes) it also seemed trickier to keep the flash to subject distance consistent, with my models dancing around in the ocean. If you have a crew and can bring a big softbox fill flash, or maybe even a small one, then yes if you can control the exposure, it would look good, but some of the work I've seen looks overfilled - when the model and background intensities are almost equal. On the other hand, that is a "look" - actually a darker background - that is used in Maxim and fashion magazines these days, so who knows. Whatever you like.
One thing if you do use flash, make sure to put a slight warming gel (like a 10Y over the flash so to the color temperature is closer to daylight, otherwise the model will look too blue. In fact, at sunset, I'm using a vary warm pink gel to match the warm tones of sunset. Like this:
Andy Pearlman Studio