Series 1 Apple Watch Vs Series 2 Apple Watch

The series 1 costs £299 and series 2 costs £399.
The series 1 is only splash resistant. Therefore if you are planning to swim or are unhappy to take it off for showers, go for the series 2.
On the Apple website it says that series 2 has a S2 dual core processor, however the series 1 has a S1 dual core processor. The speed is the same in both!
On the newer model (series 2), there is a GPS present so tracking is possible, along with many other compatibilities.
The newer model is heavier by 4.2g and had a deeper dimension of about 1mm.
I believe that they are both quite similar, apart from the excellent water resistance in series 2. They are both very helpful for sports training as they both have a heart rate sensor, accelerometer and a gyroscope.
As always feel free to comment below or contact me if you have my questions.