Stainless steel or aluminum. Which is better for the watch?

Both materials have the same function, and the watches work the same, unless you are comparing Series 1 and Series 2. However, the stainless steel Apple Watches feature a more durable display made of a sapphire crystal material, while the aluminum Apple Watch features a glass display. You can compare the Apple Watch models here.

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Hi

Which is better is a matter of personal preference.

You may find it helpful to compare Apple Watch models and their features here:

http://www.apple.com/watch/compare/