Apple Watch Scratches Easily
Stainless steel, even Apple's special Stainless Steel, can scratch. We've seen many photos and videos of the scratches that show up after a short time of use in normal conditions.
On the other hand, the Apple Watch Sport, with an aluminum case, does not scratch easily. Even after smacking the Apple Watch Sport into the metal of a door along the edge, there is no visible damage.
Of course you can use this guide to polish off Apple Watch scratches, but if scratches bother you, the Apple Watch Sport is a better overall device.