1oz in silver is just premium, so not comparing metal prices
when you take out silver to sell, usually at a discount/or spot+
I used to look at 100oz as a guide for silver price, usually just buying the kilo
as for gold, the smaller ones are premium+, so its best to compared the 100g gold bar, but we need to use the 15kg silver etc to compare
we can compare 1kg gold and 1000 oz silver bars, but we don't actually trade them, its not what we deal in
$3k in gold compared to $3k in silver
we can use the money to by gold or silver