Most people still think gold is the best investment although many of us, me included, are trying to elaborate that Bitcoin is better than gold for the last couple of years if not longer.
Most people buying Gold don't really do that with the intention of making profit, but just to avoid seeing the wealth they have been building up in their life become worth less rapidly. It's more a hedge than an actual investment. If people compare profitability fields of Gold and Bitcoin, or basically any other traditional asset, there is obviously nothing that comes even close to that what Bitcoin offers.
Eventually, Bitcoin might become that what Gold is today, so it's not that Bitcoin will always remain as profitable as it is right now. Current Bitcoin increases are nothing more than a reflection of how thin and new this market still is. Gold on the other hand is probably the most liquid market in the world, which grants very large parties the option to either buy billions worth of this precious metal, or unload billions worth of it, and that without the market going nuts.
But the price of gold isn't stable either. The Gold price chart doesn't look as crazy as that of cryptos, but still the gold price is volatile to an extent. It's just that it manifests itself in a longer period of time. For example, it was 290 USD/oz in January 2002, then it was 1,838 USD/oz in July 2011, and today it is 1,309 USD/oz. Those who invested in gold in July 2011 have lost over 25% of their investment. Just imagine how happy they would be now if they invested in Bitcoin in 2011.
Just look at this quote from an article dated 18 October 2011:
The value of Bitcoins has dropped dramatically since June 2011 when they peaked at $33: now they are between $1 and $2.