For what its worth - everyone has an opinion but here are some dealers that sell US Mint products - the most liquid silver is either US Silver Eagles or US Gold Eagles - they are also commanding the highest premium over spot right now than most other products which reflects the demand for these product and its liquidity. There are a few dealers that sell US Mint products, this is only a short list.
IME gold (I don't have silver data) Eagles sold for about 4-5% over spot before the pandemic, then folks started to talk about the end of days and such and the premium has soared to around 8%, many folks expected this to be short lived but it has endured, there is finally some showing of lessening of demand as shown by the dropping prices of the dealers that are buying back Eagles. It hasn't really shown up in the retail market and its near impossible to time the market but just thought I would share.
Here are some dealers:
APMEX
MCM
SD Bullion
Pinehurst
JM Bullion
This is far from exhaustive but I've used APMEX extensively.
The other benefit of Eagles is the risk of fraud is much lower when you buy from one of the US Mint dealers.
As I said, everyone will have an opinion but for liquidity and such US Eagles (Gold and Silver) are the way to go. They also have set production numbers and some years have appreciated far more than spot, in other words you may have numismatic value (see 1996 Silver Eagles)
Best
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