string storage vs memory

Question

i have a function in my smart contract which needs a string to work, and for this i have two options :

OPTION 1 :

Store my string in a state variable :

contract A {
    string public immutable myString = "my string in storage"

    function myFunction() {
       // do something with myString
    }
}

OPTION 2 :

Pass as a parameter the string value every time i call the function :

contract A {
    
    function myFunction(string memory _myString) {
       // do something with _myString
    }
}

My question : What is the most gas efficient option knowing that :

• the string doesn't fit in 32 bytes
• the string value must be immutable