I think 2016 will be very good for gold 
it will be better for bitcoin, and because of this i believe that it will be bad for gold, many will dump to move on bitcoin
Look back at august 2015 China stock market crisis.
Commodities, secondary currencies, Bitcoin (risk assets) - down.
Gold - up.
Thats mean - if global economy will go down - gold will rise and price of bitcoin will go to south.
in 2013 when bitcoin increased a lot in value , gold went down quite a bit
it's ssems that they are antagonist
It's not fair to compare both for such a short term. To have a good estimation of which one is more valueable an indepth research is needed.
Opinions, like stated here are not valid arguments. However a personal preference will due as an answer.
How about investing in both
?? But I genuinely believe that the price of gold would fall more in the year 2016 as the people are switching their investments to bitcoins and the reason behind it is the high volatility nature of bitcoins, anyone who wants to make a quick profit will surely invest into bitcoins.