In my case geopolitical reasons, mostly. I prefer nuclear plants not be in what the US president lovingly calls shithole countries. Those tend to not yet have nuclear, but a drastically increasing need for energy. Many of them are also a lot closer to the equator than western countries with existing nuclear, making solar much more viable than e.g. in the UK.

> What's the manufacturing breakeven in carbon costs for a windmill or a solar panel?

This questions feels like you mostly try to justify your otherwise preexisting preference. A proper system would have external costs factored into the price, by the way.