I think the answer is both. The correlation-coefficient suggests that weak readings between the two metals during clear simultaneous uptrends signal continued strength for both metals.
Thus, my strategy is to buy physical bars of each metal, at a one-to-one ratio. The two metals serve different purposes, but they are continuously increasing in value because their supply is finite and the world has deemed them intrinsically valuable. Gold has proven this concept ever since humanity first adopted the concept of wealth accumulation. Platinum is a fledgling comparatively, but I suspect it will prove-out long-term, even if the concept of marriage is trending bearish.
"Experts" seem to collectively agree that platinum is more speculative than gold because it is used primarily in manufacturing (which is a bet on future economic growth), and not investing nor as a universal store of value. Whenever "Experts" have the same idea, I immediately think the opposite is true (think March 2020 "financial guru" bears).
Thus, I have my ratio set to 1:1 because the benefits of gold are obvious and time-tested. I like both metals equally and buying them both when one is clearly undervalued just makes logical sense in my piggish brain.
I also tend to be a paranoid-ish pig at times, which is why I prefer to purchase the stuff in physical form. I clearly see that fiat currency is becoming more a figurehead and less a de-facto store of value - as it can be printed limitlessly. So long as global government(s) maintain control of their people, fiat currencies have value. Should that change, I'm happy that I have physical assets. Whether you buy physical or prefer paper derivatives, I'd maintain the same outlook of 1:1 buying in the near/midterm.
Whether it is platinum, gold, palladium, rhodium, or silver, it is clear that metal is on the rise once again. I just like these two the most.
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