Snopes on most topics, they are accurate.
Snopes and Politifact are the worst offendors of logic and common sense. They rate a statement about the future. It is impossible to fact check a statement about the future.
Hence the qualifier. There are some where they jump the shark, and quite a number of people take them to task on it on their forums. Unfortunately, most of those articles are amended or removed after they’ve already done damage.