Which of these languages...

is the most worth learning, in your opinion, and why?

Russian, Turkish, Urdu, Punjabi, Korean, Hindi, Arabic, Chinese, Bengali.

Additionally, which countries that speak these languages are pleasant and which are shitty?

Also, if I pick Chinese or Russian, I would have to obtain at least an elementary level of speaking/writing/reading before next summer. I have the resources and time for this, but it would slow down my progress in the other languages I'm studying.