Question: what is the difference between apple watch s3 and s4?
Answer: There are a few key design differences between the two watches. The Apple Watch Series 4 has a bigger case size than the Apple Watch Series 3, and it also has a bigger screen. The Apple Watch Series 4 has a slightly larger case size than the Apple Watch Series 3. ... Apple Watch Series 4, 40 mm — 759 sq mm display area.