Question: what is the difference of the apple watches?
Answer: Design and display The biggest physical difference between the Apple Watch 4 and the Apple Watch 3 is the size of the body, as while the Apple Watch 4 comes in a choice of 40mm or 44mm, the Apple Watch 3 is available in a choice of 38mm or 42mm. ... Both watches are also waterproof to depths of 50 meters.