Sounds like most agree the best choice for ripping is MacDVDRipperPro (aka MDRP, $10) or Fairmount (free).
Doesn't seem to be as clear for remastering. The contenders appear to be: DVD Remaster (Metakine), DVD Copy for Mac (Danuisoft), DVD Copy (iSkysoft), and DVD2OneX (compresses but won't burn).
Anyone have suggestions for the authoring/remastering software that works best (for creating DVD backups, D9>D9 and D9>D5)? Since MDRP's website references DVD Remaster and Fairmount comes from Metakine I'm guessing DVD Remaster is the way to go.