enum VS static immutable

[ref2401]

Hi.
I have this structure:

struct MyStruct {
        enum MyStruct VALUE = MyStruct(5f);
        static immutable MyStruct value = MyStruct(5f);


        float data;

        this(float v) { data = v; }
}

What's the difference between MyStruct.VALUE and MyStruct.value? 
How should I decide what to use?