Sub-division are quite effective in modeling organic things, if you need really smooth staff is the
good choice. But! :)
When you come to the point of texturing, you'll find it quite messy. So did I. It is really difficult to sort out UV for sub-division surfaces. Because of that I had to convert all my sub-divs to polygons in order to sort out textures. Jaison said that smoothed polygons requires less resources. Also he mentioned that mentalray has some problems in rendering sub-div. He showed me a sub-division proxy for polygon object, which could take you close to editing polygon as a sub-division.
sub-division proxy
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