If those are your only options, then DV-NTSC is probably best.
By the way, you're confusing resolution with aspect ratio.
Aspect ratios (like 4:3 and 16:9) are the proportion between the width and height of your video screen. So if the width is 4 in a 4:3 video, the height is 3, and if the width is 8 (4 x 2) then the height is 6 (3 x 2).
Resolution is the actual size of the video. 320x240, for example, means that you have a 320-pixel wide and 240-pixel high screen. The resolution values.
That said, you can have a resolution like 720 x 480 that doesn't fit the 4:3 or 16:9 proportion but still works perfectly with XviD because both 720 and 480 are multiples of 16.
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