About the only thing you can say about commodities is that on a small scale at least, you will still have something to show for your investment when the price goes down. With paper assets you can't even melt them down to fill teeth. That is if you actually take possession of the stuff itself as opposed to buying futures etc. The problem then is that like diamonds, the guy who just sold you an ounce will offer you substantially less if you offer to sell it back to him before you take it off the counter, and less still plus an assay fee to confirm it is the real stuff if you take it home and bring it back the next day.
Clearly the central banks of the world are trying to force savings into the "economy" by loaning other banks money for free, and devaluing currency via "quantitative easing." Given the fact that insured savings are not keeping pace with inflation, everyone is tempted to put their money into stocks, commodities or (if they have short enough memories) real estate.
There are no fundamental reasons why the stock market value should be greater now than in 2007. The increase in value of stocks is entirely due to the implicit subsidy by the Federal Reserve et al. The smart money knows that, and there is a very high probability that if the subsidy is withdrawn, there will be a sudden massive flight from equities that will leave those who cannot execute orders in milliseconds holding the bag again. The situation is similar in other alternative savings options like gold or silver.
Whatever else you may think, you are buying into a bubble, and if you are not planning to get out quickly you stand a good chance of being burned. Alan Greenspan (the arch enabler of the real estate bubble, and father of the great recession) supposedly asked some of his banker friends why they took the risks that ruined their businesses in 2008 and was told that they all knew it was a bubble built on bull excrement, but they figured they would be smart enough to get out in time to leave the rest of the investment community stuck with the losses. Most of them were not that smart.