This webapp is still in development. There will be bugs, but hopefully they won't affect gameplay very much. To assist with development, all traffic on this server may be logged.
The name you enter and your computer's IP address will always be logged when you load the game client. Chat and gameplay may also be logged (but 99% of the time, it won't be).
These servers are functionally identical. Just make sure you pick the same one as your friends (or follow their direct game link).