A lot of people are usually confused about the difference between the iPhone 5s and the iPhone 5c when they were released. One of the biggest differences between the two is their mobile processor.
The 5s has a 64-bit mobile processor while the 5c will have a slower processor which would also explain why this is priced lower as compared to the 5s. When it comes to their screen size, they are the same at 4 inches.
Remember that this was the time when small phones were still a thing. There is also a difference in their weight. The iPhone 5s weighs 3.9 oz while the iPhone 5c weighs around 4.6 oz.