It's really noticeable on galka and elvaan. Only a slight difference for mithra and taru. I'm a 'large' mithra, and my sister is a 'small' mithra and she's only about half a head shorter then me. Since it doesnt effect stats, just pick whichever one you like.
Edit: I'd figure a hume small vs large would be about a heads height difference, and that's all it effects, is height, not actual size or build. You'll still look the exact same, just a bit taller.
Edited, Mon Oct 17 16:06:02 2005 by clintffxi