There is no better in this instance. It all depends on your risk aversion. As is mentioned countless time in this thread; generally speaking gold tends to be quite stable while bitcoin is very volatile. Based on this premises (which is merely my humble opinion) you should ask yourself what your investment strategy is. If you want to take a speculative stance you could probably go with BTC (chances are rather SMALL that you would make BIG profits), however if you go with gold your investment portfolio would probably behave less crazy (chances are rather BIG that you would make SMALL profits). All in all, it depends on your appetite for risk.

This being said it seems that both investment-products SEEM to behave similarly in that they mimic currency hedges. The recent financial turmoil causes relatively scarce (im-)materials to go up in value (the market signalling that it does not like too much risk). This however is not a substitute for individual risk-aversion but rather tools to understand how different products might behave in different investment/ economic scenarios.

Personally I'm a big believer in the idea of bitcoin; rather than the trading-tools we now use for exchange -which on a large-scale sense- depreciate with every breath we take, bitcoin cannot be tampered with given its finite nature. This means that nobody can influence its value if BTC would be the incumbent trade-token in the world. In my view purchases which are made currently shift in value in both the currency and the product while in world where we all use bitcoin it would only be the product that loses value. Let's do this thought experiment;

If you were to live in Europe and you purchase a US made product you'll trade your EURO for a DOLLAR at the spot price of the sale. If the EURO would devaluate in one week time and you look back at your purchase t+1week you would have made a deal that you cannot reproduce a week later as you will need to pay more euros to obtain the same amount of dollars. If there is only one 'currency' however there would not be a devaluation as you there is nothing to devaluate against. In this case we'll leave the depreciation of the product for what it is (you would not buy the retailprice for the Iphone 4 when it came out because you can buy an Iphone 5 for the same price given both options at the same time).

I'll end my jibber jabber on this note; if you want to feel the thrill of investment pick up a few bitcoins and get the excitement of a volatile product. In my view this 'disruptive' innovation (OH NO HE DIDN'T - yes I did just ripped this marketing biscuit) might just make it and revolutionize human trading as we see it today. If not, do what everyone does; diversify *snore*

(sorry for the long post)