I would say yes. When you are ready to quit your application (2-3 months?), More and more compatibility issues need to be developed. In addition, if you encounter any problems, you can send corrections and contribute to faster compatibility 1.9.2!;)
But to answer your questions, given the gems you want to use, 1.9.2 is good. However, Heroku has not yet deployed 1.9.2.
geetfun
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