Best screen protector for Apple watch

To me, it depends on which Apple Watch model you purchased. If you own a Stainless Steel model, it has a Sapphire glass screen, which is almost impossible to scratch. But if you bought an Aluminum version, the glass is not as scratch resistant and personally, I would put a screen protector on the glass on the Aluminum watch.

That's me personally, but I've seem too many Aluminum watches with scratches on the screen and see none of the Stainless Steel version with scratches.

Zagg and Belkin are two top tier brands you could look at in screen protectors.

I believe by far the best screen protector for any Apple Watch is no physical material at all - just self-discipline to take care of the screen.

Glad that helped. Enjoy your Apple Watch.