Well, I really love CloneDVD in combination with AnyDVD. Why ?
AnyDVD surely isn't a perfect product but it gets constantly updated and really does the job it was designed to (problems only arise when it comes to unprotected discs (DVD or CD), but you can turn it off then).
CloneDVD is easy to use, constantly updated, and gives very,very good results. Olli (author of CloneCD/DVD) is a competent member of this forum and always willing to help quickly. Just install the trial versions and judge the tools for yourself.
I rarely use other tools (DVDDecrypter, Vobblanker, etc.).