I'd just like to add, as it wouldn't let me edit my post above, that I believe it's important to know both modeling and sculpting, in order to achieve the best results overall.  Depending on if you are looking at this from a professional perspective, or just as a hobbyist; knowing how to poly model object will never be a waste of time.  If nothing else, it will build a solid foundation of skills that will surely assist you in whatever you are doing in the world of 3D.  It's never a waste of time to learn something anyway.

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