ReBuilder uses CCE for its encoding, leave ALL transcoders standing still. We are talking picture quality here. While Shrink is so darn easy to use and you can rip this out and that out or movie only, what ever you do the picture is still Transcoded. With Rebuilder, the only thing you can rip out is audio tracks (you need to run DVD Stripper first if you want more out) but it Encodes the Movie & Extras etc.
If a movie needs 90% compression to fit to a DVD, then there will a small difference, but with a 50% compression (typical with TV series DVD's) then results are heavily weighted to a CCE encode.