Help choosing between iphone 4s, 5c, 5s?

I currently have the iphone 4s. I think the 5c and 5s look really cool though. I was thinking about getting one of the two, but I had a few questions.

1. What is the difference between the 4s, and the 5c and 5s?
2. What's the difference between the 5c and 5s?
3.Is it worth it upgrading models? Or is the phone I have pretty much the same as the new ones.

I prefer iPhone 4S

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