24GB is definitely solid. 16GB is like my minimum recommended for any kind of Mac, but if you can go for more you should go for more. I think 24GB should last a good long while though.
16GB, depending on your use, can be constraining and, sometimes, you need to get creative with complex processes. My colleagues complain about developing with several containers running peripheral services. In similar situations we asked the services teams to provide mocks that answered the same APIs without needing a large memory footprint.