As you level up you will mine different ores and skin different creatures in different zones. At pretty much each level there is a zone that provides the most effective place to "farm" materials no matter which faction you are with.
The only difference 1-60 is that some zones might be easier for Horde to get to and some might be easier for Alliance ie. they only have a flight path for one side but it pretty much evens out in the end.
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