Bitcoin and gold are both good in my opinion. But if you were to ask me to pick only one, I'd have to say Bitcoin.
better choose one. if the dollar strengthens both the price would be decreased right ? you will lose double
Incorrect. They will both rise with the rising dollar in 2017. That is certain.
They may (or may not) both crash first in 2016. Possible lows are < $850 and < $150, but this is only a possibility.