I can say you can go for Sony Xperia z2 because it is water resistant, has got a good 20MP camera and has got good graphics as well. As samsung galaxy s5 is a water resistant but still water entered into the mobile and destroyed my motherboard. But if you compare with Iphone 5s it's not much better. Iphone 5s has got much better camera and graphics as well but not water resistant. After all Sony xperia Z2 is perfect.
