I'll make it clear right now. There is no best way to store your seed phrase. (I know, how dare you) Why? Because storing your seed phrase is unique to you. Like many things in life: something that works for you, might not work for someone else. Everyone is different. Storing your seed phrase is specific to what works for you and your situation.
For one reason or another, you want to destroy your metal seed storage. Specifically because you want to dispose of it without someone finding it and being able to identify the words in your seed phrase. But, people (including you) tend to store their seed on metal for a reason: to make it virtually indestructible. Counter-intuitive, I know. You're stuck between metal and a hard place.
You might have heard that your seed phrase is all you need to recover all of your coins. That's true! But, your seed phrase technically doesn't "store" your coins, rather its used to find them. But what does that mean? They're just words. How are words used to "find my coins"?