If your website is hosted on Abaco Hosting's Linux servers, use the SFTP option. Also, you must use the default FTP user that comes with your cPanel account. You cannot connect to CodeGuard using any other FTP user. For Abaco Hosting's Windows servers, use the FTP option.
In case of other hosting providers, you can choose either the FTP or SFTP option, based on your service provider's settings.