It depends on how much you are buying. If you are buying over a thousand ounces bars or monster boxes take up less space. If you are buying a hundred ounces 1 ounce coins and 5 or 10 ounce bars might be better since they are easier to sell when the time comes. My personal favorite is kilo bars. These are really cool:
https://www.scottsdalemint.com/product/1-kg-tombstone-silver-nugget-silver-bar/
It depends on how much you are buying. If you are buying over a thousand ounces bars or monster boxes take up less space. If you are buying a hundred ounces 1 ounce coins and 5 or 10 ounce bars might be better since they are easier to sell when the time comes. My personal favorite is kilo bars. These are really cool: https://www.scottsdalemint.com/product/1-kg-tombstone-silver-nugget-silver-bar/