Above screenshot shows post-Christmas 2013 thru March 31, 2017:
Which one to buy??
Breakdown of performance for that period (in USD terms):
Bitcoin/USD: +80%
S&P 500 Stocks: +30%
Real Estate (REITs): +26%
Gold: +3%
Bonds: +1%
(Note: Bitcoin performance
suppressed due to post insane Chinese-run in late-2013)
If I were you I would buy bitcoin since it's price growth is faster than gold and others but if you want to lessen the risk and if you don't trust bitcoin yet, I think it would be good if you would diversify your investments to all of what you mentioned. If you would buy bitcoin, I recommend that you wait a little for a price dump so that you can buy cheaper bitcoins unlike now that bitcoin is table to 1083$ that might go down a little before going up.