Metal Shader pointer or local copy performance

I have a metal kernel function that reads, processes and writes elements in a huge array of data, stored in device memory

device Element *elements [[ buffer(0) ]],

I'm wondering what's better in terms of performance? :

• Make a copy of the array element into local thread memory :

Element element = elements[thread_id];

• Or, use a pointer to that element :

device Element *element = &elements[thread_id];