The difference is that the ceramic back is only available on the LTE version. In theory it will be more resistant to abrasion but this is not a real world issue. Your arm is much softer than the watch and is not abrasive so it will not damage the watch.
hello apple, I am from Indonesia. want to ask about apple watch series 3 42mm what's the difference between composite back with ceramic back ?. more durable or more scratch resistant which one? thank you for your answer.
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What’s difference between composite back and ceramic back. Apple watch series 3 42mm