Question: what is the difference between iphone watch series 1 and 2?
Answer: Series 1 (left) only comes in aluminum, while Series 2 (right) also comes in more expensive steel or ceramic models. But here's the big difference: Series 2 (right) is swim0-proof to 50 meters, and has built-in GPS, Series 1 (left) doesn't. Both watches feel the same; Series 2 has a brighter display, though.