Either presents real world advantages, but in retrospect I would give both equal weight. When there are cool new ajax applications and ruby-on-rails developments happening, it is very interesting. German of course would offer me a new world of ideas and people with which to share. Neither is needed for my day to day, but would be another nice thing to keep in my hip pocket for a rainy day.
I'm still in Europe, and I'm still relatively young....maybe I have time to learn both yet.
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