I feel that I should apologize for the misstatement I made at the beginning of this thread:
My recollection of having read an article comparing SuperDuper to DiskWarrior was totally erroneous! I finally found the article to which I thought I was referring:
http://db.tidbits.com/article/9639
And if one reads deeply into the article, you will find that
SuperDuper receives quite favorable mention --- and it wasn't being contrasted to
DiskWarrior!
However, this experience was quite educational for me, as I was alerted to the value of having both
SuperDuper (full backup) and
DiskWarrior (disk utility). Following Dave's gentle response to by query, I have purchased and installed
DiskWarrior --- and I've found it to be a fantastic complement to SD.