Hello. I want to buy an Applewatch 4. It’ll be my first Applewatch. I think I will buy the aluminum cause the stainless is really more expensive. I want to keep this watch 2 or 3 years, so I need one that is strong. Do you think that the iron is really more strong ? I have readen that the aluminum is more fragile, specially the glass and that the black color can scratch and remove easily. What do you think ? What is your advice ? Thank you very much.