I'm likely upgrading to a new iPhone today. I currently have an iPhone 4. I'm considering the iPhone 5C or 5S, leaning towards the 5C, due to the cheaper price. My question about the 5C, is since it is a plastic finish, does it seem to overheat more when charging, or just be a problem in general? I also don't know if the white color or the blue one looks better. Also, what makes the 5S so much better? Can anyone who has either recommend which one?