To put it simply they are built differently, with a different purpose. Saying that, it might lead you to think that the hardware that is used within them is much different…But that’s not the case. The real difference lies with the firmware and the drivers which deal with the GPU.
The Samsung Gear S2 could well be the subtlest smart watch on the market, It’s minimal and modern design allows it to blend in but stand out at the same time. The S2 has three methods of interaction, The touchscreen, the home & back buttons and the rotating bezel. I fear that if you didn’t know the S2 had a bezel then you may miss it due it blending so well.
Google Duo is what seems to be Google’s answer to Apple’s FaceTime. It was released in mid-August after being announced in May and it took only two days for the app to become the number one free app. Duo is cross-platform and unlike google hangout, allows you to use your phone number as your account.