Also, the conditions at sea make me think that wind farms would have a bit of advantage. It would seem that during conditions that require the greatest energy to stabilize that wind has more power than solar.

I'm also curious how cloudy/foggy ocean sites are compared to ideal desert-based land sites like Nevada. That also might be a factor.

Going to the expense of making a large offshore solar farm which is useless for half the day doesn't seem like as good an investment, even if all the other technical and weather issues were OK.

Among the benefits of offshoring wind turbines is generally higher and more consistent wind speeds offshore, less nuisance due to noise, and the ability to construct larger, more effective turbines than is possible on land.

For solar, there's not necessarily more or better sunshine offshore. There's no reason an offshore solar panel would be fundamentally different from an onshore one. And due to the much harsher environment, much of the difference between the two would relate to corrosion protection and reliability (adding to its cost).

For offshore solar you'd have the complexity and cost of offshore installation and maintenance, without the clear benefit of better sun offshore. That's a hard pill to swallow when there's so much potential to have solar panels on land.

And then you have to protect your project from salt water and the waves.

The waves are especially tough, because rogue waves can create pressures of 100 tons per square meter.

https://en.wikipedia.org/wiki/Rogue_wave