Can't really compare the two IMO. DVDFab Express (the commercial version) is a one-click backup solution for copy protected DVDs. It can compress and backup DVD9 discs to a single blank DVD while removing all the restrictions on the original DVD. DVDFab Decrypter is a freeware for ripping protected DVDs to the hard disk.
ImgBurn is a completely free and excellent Image Burning app that will work with almost all modern drives and has BitSetting support. You can also use it for erasing your RW media. Different tools for different uses.