Junk silver is a term for circulated, pre 1964 coins containing silver. Some may be only 50% silver but there’s way more melt value then face value. And since they are circulated they aren’t particularly attractive to coin collectors.

Dimes are like 90% silver and small. So they are really nice for transactions if the dollar goes to pot. They’re relatively value dense, relatively small denominations on their own, and easy to carry. You might not get change from your quarter or half dollar.

Silver Eagles tend to have a premium on them since they’re easy to identify and a proven source of real silver.

If you are storing wealth, bars are better. But if the manufacturer isn’t well known you may take a little hit selling it later.