Obi-Wan said:
PAL also has a higher framerate than NTSC
No it doesn't. PAL is (usually) 50Hz (25 fps + interlacing), whereas NTSC is closer to (but not exactly) 60Hz (30 fps + interlacing). PAL is still a better image though, as there is more resolution and better colour definition (which theoretically wouldn't be true for a 100% digital transmission between DVD player and TV, e.g. DVI or HDMI, but I haven't had the opportunity to try that).
DragoonClawNZ said:
Even if TVs don't have support for the other format, thank god for region free DVD players because it gives you an option to watch any DVD in PAL or NTSC. The only downside is if you watch it on the opposite format (NTSC DVD set to PAL), the frame rate is limited. For instance, a TV series that runs at full 60fps will only play at 25, same with PAL on NTSC at 30.
That is not the only difference between PAL and NTSC. Most (if not all) region-unlocked DVD players will not attempt to convert between PAL and NTSC depending on what your TV supports; a PAL disc will always output with PAL, and an NTSC disc will always output with NTSC. One device that does convert between the two systems is an unlocked Gamecube, but it can't play DVDs without extreme hardware modifications.
In Australia, where I live, pretty much all TVs are PAL/NTSC compatible. Most even support SECAM. Analogue broadcasts are in PAL, and almost all locally-produced DVDs are published for use with PAL (region 4).
However, even with the compatibility, it doesn't always work well. I have an Australian, region 4 copy of Dilbert, only available in NTSC, which looks absolutely awful. This is probably due to both the difference in colour systems (NTSC has poorer colour definition than PAL) or to an encoding issue with interlacing (which would be exasperated by the difference in resolution along the lines of displaying a 640x480 image on an old 800x600 LCD).
In summary, PAL is better. :)