Gold and silver both played a role in past bi-metallic monetary standards. Even if silver isn’t made money again, its value is likely to increase more than gold.
Historically the silver to gold ratio has been about 15:1.
15 ounces of silver would buy 1 ounce of gold. Today that ratio is over 80:1. At time of writing, the price of gold is $1300. Silver would be worth $86/oz with the historical ratio of 15:1.