With more ties to the economy because of its use in various manufacturing components, platinum has been outperforming gold throughout the recovery. Platinum got hit during the April/May/June market downturn, while gold remained relatively stable. Since July, however, platinum has moved up into overbought territory while gold is closer to oversold levels.
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During the '08 market crash, the ratio of platinum to gold got below one -- meaning gold was trading at a higher price than platinum. As shown in the chart below, this hadn't happened since the mid-90s, and a ratio between 1.5 and 2.4 was a more typical reading over the last decade or so. The ratio has been trending higher throughout the current bull market, however.
If you think the economy is set up for a period of expansion, platinum is a better bet, as the ratio will likely creep back up to levels closer to 2. If you're worried about the economy, gold is the better bet.