Rhodium. I'm going to be accused of shilling for Baird, soon LOL https://online.kitco.com/products/31032/1_oz_Rhodium_Baird_Co_Bar.html
I checked silver but I think everybody should have gold&silver. by $ value I have more in gold at present so I'm going all silver for a while. should be more upside to silver but who really knows. that's why you need gold too.
They are not really equivalent investments. You should consider what drives the prices of each and then compare that to your goals and time line for investing.
I would say gold is the traditional must-have metal. Silver is a precious and industrial metal, which gives it some upside advantage but also makes it more susceptible to confiscation if there is a shortage that affects the military or industrial output. I know that's a longshot, but gold is the one to have if you can only have one.
I know I will sound like a broken record, but I still say "it depends". You want lower transaction costs, more evened out returns, and ease of liquidation? I would say gold. You want a longer term bet on innate rarity and industrial usage? I would say platinum and palladium. You want a blend? Try silver. Without knowing peoples desire to own, timeframes, other assets, etc. I simply find it hard to answer. Sorry if that sounds like I am bailing on the question, but I do not find one "best fit" amongst the choices for everyone.
Surely there is an answer to this. Which one is it and how much of our portfolio or assets should be in it?