DVDxCopy Espress 3.0 question

[The One]

I have been using DVD2one but decided to try DVDxcopy Express because it was simpler and eliminated the need to use DVD Decrypter. My question is, why does the movie end up so much smaller with DVDxcopy Xpress 3 than it is with DVD2one? The same movie was a full 4.3 gbs using DVD2one but it was only 1.9 gbs using DVDxcopy Express 3. I selected the same audio and subtitles.