PAL DVDs are better than NTSC DVDs in a couple of ways. One of those is higher resolution, and the other way is a cleaner sequence of frames — ones that do not produce interlacing artifacts.
That is, of course, unless the producer of the PAL DVD messes them up. This has happened with the Roadshow Entertainment titles Pulp Fiction and Mad Max, and the 20th Century Fox title Independence Day. Read all about itin my new essay.