Found the new best one! eqftp. This is better because it allows you to browse the server. Version 0.7 adds support for sftp as well.
https://github.com/Equals182/eqFTP
Since this was marked as the right answer I will also say that even though this is the best brackets plugin, I have found that atom's Remote FTP is the best and most reliable sftp editor I have found: https://atom.io/packages/remote-ftp