5-year performance:

Gold: $1654 - $3114 - 88%
DJIA: 21678 - 42155 - 94%

The gold performance is based on spot bullion raw gold. Fabricated gold products like US & foreign gold coins gain numismatic value in addition to spot market gains. An ungraded BU 2020 $1-ounce gold US Eagle coin currently sells for $3300. In MS70 condition, it sells for $3400-3600. These coins have outperformed the DJIA consistently over the past 5 years.

What this suggests is that both have been good investments, and a balanced portfolio would have both.