DVDFab's way around Cinavia only works on older PS3s using an old firmware by using a loophole/oversight. This has been plugged. DVDFab's method required specific Blu-Ray burners that had a feature which not all do. So, the method worked on a limited number of standalone devices - just the PS3, required that you could not update your PS3 which meant you would wind up with issues if you play games online, and you had to have a specific Blu-Ray burner. That's a bit of a hassle to put it mildly.
The AnyDVD method works with every Blu-Ray licensed software player that I am aware of (ie PowerDVD, Arcsoft TMT, etc). As new updates are released Slysoft updates the feature if a problem arises (ie the latest Arcsoft TMT 6 release).
In short, you really can't compare the two solutions but Slysoft's workaround allows much more freedom.