Speed of deployment + complexity (bugger all) + safety of deployment (passive product v product that can root entire ecosystems) + ongoing maintenance means solar>nuclear any day.
Nuclear is over priced, high risk centralised power. Yuck.
That depends on which renewable you're talking about.
Wind and solar both. Which of those is cheaper varies with circumstance.
Yes, wind and PV solar... but there are many other types of renewables. The rest are still more expensive than natural gas currently.