There's also the saying of the golden hammer, where everything starts to look like a nail. But honestly, for a lot of problems whatever tool you're most familia

There's also the saying of the golden hammer, where everything starts to look like a nail. But honestly, for a lot of problems whatever tool you're most familiar and comfortable with is probably going to be the best. This is especially true if the alternative is that nothing at all ends up getting built. Facebook got written in PHP originally and then they migrated as needed. Twitter was written in Rails and then they migrated as needed. Postgres is an amazing default choice for a database, especially if you're already familiarized with it and you don't have much expertise within the domain.