All things being equal, would there be any quality difference between compressing DVD-9 to DVD-5 using CloneDVD vs. other software such as Nero Recode 2? This assumes an apples to apples comparison of not removing any chapters or anything. Just a straight compress and copy of an entire commercial DVD to a single-layer DVD+R or DVD-R. Would there be any noticeable difference in quality of the final DVD?