The difference between the iwatchs7 and s8 is that the materials are different and the chips are different.
iWatchs7 and iWatchs8 in appearance, the biggest difference is that iWatchs7 uses aluminum alloy material, while iWatchs8 uses stainless steel material. In addition, the iWatchs7 uses the Apple S5 chip, while the iWatchs8 uses the Apple S6 chip, which is more powerful and smoother. In addition, the iWatchs8 also comes with more advanced heart rate monitoring and blood oxygen monitoring, while the iWatchs7 does not.