Of course there are Mac-only, Linux-only, and Windows-only editors as well. As a Windows user myself, I really like Notepad++—because it’s a native Windows app written in C++ and is super light-weight (only 2.8MB for the latest version!), it’s by far the fastest code editor available on Windows, and it helps that it looks & behaves like a native Windows app (unlike Sublime, which is also fast, but doesn’t look like a Windows app at all).
On Linux, which I also use, I prefer using a combo of Sublime with Geany. vim is too hardcore for me.