Yeah RW99 is typically right. Your camera's snesor has a native resolution, which is one of those modes (usually 4:3). The rest are just crops.
16x9 - fits on HDTVs perfectly
4:3 - fits on old-school (non-widescreen) monitors perfectly
3:2 - old-school film ratio. Digital prints often use this ratio too.
Basically, it depends on:
a) the shot
b) what you want to display it on
And you can always crop from one to the other assuming you're not using a really small resolution, which is exactly what your camera would be doing anyways. Also, you can always frame your shot as a 16x9 or 3x2 to know what it would look like cropped, then shoot as a 4x3. Or take both: the joy of digital is you're never wasting film!
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