ive been hearing such good things about CCE and DVD R-B, so i decided to give it a try. ive used DVDShrink ever since ive been backing up my DVD's, and recently got CloneDVD, not to replace DVDShrink, i still use Shrink just as much, but to try it out. the only time i use clonedvd is when i want to preserve the menus and remove the extras. i know how to do this manually so i can do this with shrink, but i find it to be too much work and i can do it automatically with clonedvd.
anyway, i backed up gladiator a few years ago with dvdshrink. compression was at about 33% compression, but i forget if i used sharp or smooth for the AEC option. i tried using DVD R-B with CCE 3-pass and 4-pass at about 36% compression, and also experimented with different quality prec and vbr bias settings, but everytime, there was much more noise with the output of CCE. overall, id have to say that the dvdshrink output was actually better.