Of the two, you asked, I would personally say, Google Code because of the uniformity of all projects. The Google Code project is similar to all other Google Code projects. It is very easy to find the information you need due to the fact that all GC projects have the same layout, indicate project activity, the ability to manage the GC project website through version control. It just provides a simple, intuitive interface for you and your community with powerful tools for remotely managing it.
Personally, I suggest github. This is all I talked about above, but with the ability to use Git. Almost all esk code archive sites provide you with the same features as another way to interact with the user.
Also, a personal note, I'm just leaning from Sourceforge because it always looks so busy no matter what page you're on. This is somewhat unpleasant and unnerving.
Matt
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