Ubuntu. I've found that a decent amount of software for development is just harder to install on Windows. The open source community seems to mostly be on Linux,

Ubuntu. I've found that a decent amount of software for development is just harder to install on Windows. The open source community seems to mostly be on Linux, and they often have the best support and installation processes for Linux. For example, setting up Emacs and getting the packages I want installed has been much easier on Ubuntu than Windows. This has also been true for a lot of other great open source software.