 Quote by Nugatory
Although this is to some extent an aesthetic preference, I find myself saying they both follow from relativity of simultaneity, which in turn follows from the two postulates.
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I think all three follow from the two postulates. It is also easy to come up with transformations that have time dilation not relativity of simultaneity or that do not have time dilation but do have relativity of simultaneity, so I think that it is incorrect to say that time dilation follows from relativity of simultaneity. Similarly with length contraction.
I had a LONG conversation with mangaroosh on this topic, but basically it didn't go much further than post 2:
http://www.physicsforums.com/showthread.php?t=575332
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