Disclaimer: All theory here, I have none of this.
I would think that wind
is they way to go. And if you already have a genset, even better.
Many times you don't have sun: Bad weather
, and I seldom see the sun out at night (not since that time at Haight-Ashbury the 60's anyway).
Some times you don't have wind
How many times do you not have either? Seems like a combination would be the way to go. If you need X amount of power to keep going, for solar, you'd need at least 2X to compensate for night, or maybe 3X to also compensate for no sun for a day... Wind, similar, maybe 2X would be good enough? With both solar and wind, maybe 1X each or 1.5X each? And less if you can use a genset some of the time.
Having both would cost more, but if you can reduce the size of each, might not be much more. And less space needed for solar panels
and maybe smaller blades and less weight for the windgen.
The ratios above are totally ficticious, but the general slant is probably there. Anyway, I'm just thinking outloud.