Whats the difference between ntsc 16.9 525 lines,pal 16.9 625 lines and 16.9 under video source setting in tmpgenc.

If i have a widescreen movie to encode to vcd and its pal 16.9 would i b better off setting the video source to pal 16.9 625 lines or just 16.9 ,as under video stream settings where u choose what u want the mpeg to b there is only a 16.9 525 lines and a 16.9 625 lines.