Career wise, I'd say don't even worry about what stack you choose. Ignore all those posts about ".NET will land you corporate jobs."
Companies should not worry about what languages you have experience with. They should care for how much programming (not languages) experience you have and how fast you can learn new concepts and new languages. Know your algorithms, and data structures etc.
you wouldn't wan to work for companies (especially startups) tht require "3 years of Ruby." That's just shallow.
That's why Google Apple amazon MSFT hire the best folks. They don care what langs you know. They care if you can code and solve problems
