I've done my (hopefully) due diligence on platinum, but I'd like to hear out the opinions of anyone here if it is a worthwhile investment or something to avoid entirely.
Gold is the king of precious metals. Currency was gold. Central banks still buy and hoard gold. Some cultures still their citizens invest primarily in gold. There is no substitute.
Silver is second banana. It's cheaper and has more industrial uses so the economy has more of an effect on the price. It's (accused) of being subject to price manipulation that's much harder to do with gold. It was and is the common man's precious metal, and why dimes and quarters were made of silver while $5 and $20 coins were made of gold. It's why survivalists still stock up on junk silver. It's why you can buy meme coins made of silver but not gold.
Platinum is neither of those things. It's classified as a precious metal because of how it behaves but doesn't hold nearly the position that either gold or silver have in human society. Platinum is more difficult to find, try going into your local coin shop and asking to see where the platinum is, they may not have it at all. The spread is absurd; Hero Bullion, a good dealer,
sells a 1/4 ounce Platinum Eagle for $323 and buys it back for $242. How long would it take for you to profit off platinum with that kind of spread? And if your coin shop doesn't carry it, because there's no demand, what purpose does it serve as part of your stack?
If things turn sour, a little gold will let you get past the border guards, and silver could be used for common trade. Platinum doesn't work for either, it's not instantly recognizable like gold and it's not cheap like silver. In times of stagflation, gold (and silver to a lesser extent) help preserve wealth because it's been money for thousands of years. Not platinum.