It's not up on a torrent yet (which is what you're referring to). If you want the older DVD-5, you can find that on Demonoid, along with the DVD-5 of the "Purist Edition."

PAL is the TV format for the UK and most of Europe - it's 25 frames per second and a little bigger image size-wise than the American standard, which is NTSC and is 29.97 frames per second (though NTSC DVDs are usually 23.976 fps, which is 0.1% slower than film's 24 fps, for TVs that can display progressive scan rather than interlaced).

Basically, if you didn't understand anything in that last paragraph, if you live in the US, download NTSC. If you live in the UK or Australia etc, you really can download either one, but you probably should download the PAL version.