Codespaces is a remote development platform offered by GitHub, but it's not an option for enterprise customers using self-hosted GitHub. Coder is a popular choice among these enterprises due to its support for multiple Git providers and ability to be deployed on various public clouds or on-premises networks. Coder also offers extensive IDE support, including web-based forks of VS Code and support for native thick clients like JetBrains' IDEs. While GitHub Codespaces has some advantages, such as being free for individuals, Coder's flexibility and support for a wide range of developer tools make it the preferred choice for many enterprise customers.