New answers tagged file-format
I would suggest using fbx. It is much more widely supported by other tools and that generally means that even in Unity, more effort will have been spent on making sure that fbx works properly. If you need to import your models to other tools besides Unity for processing etc, you will probably need fbx anyhow. Also, if you decide to use some other modelling ...
Usually FBX is preferred for exporting the models. You can follow this link for more info. http://docs.unity3d.com/Manual/HOWTO-ImportObjectBlender.html
You should change the convert_alpha() part to just convert(), as the convert_alpha() changes the transparent pixels.
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