1 year ago I would answer gold. But after seeing numerous slam down on the price due to the dumping of fake paper derivatives I realize that this market is not for me, it's for the bankers to make money as they know the exact movement of the precious metals markets.
The bitcoin price is extremely volatile but atleast it reflects that of a free market. I will go with Bitcoin no doubt.
I still hold some gold, but for me it's a hedge whereas I see bitcoin more of an investment