I currently have a space gray aluminum Apple Watch series 1 and want to get a series 4. My screen is in awful condition right now because of scratches. My question is if the sapphire glass on the stainless steel version is really that much more durable. I also love the look of the space black stainless steel and can somewhat justify the price now that an Apple Watch is essential to me. What is your opinion on the durability of your stainless steel Apple Watch and is it worth the extra money?