Which iPhone is worth getting?

Okay, so just recently Credo Mobile got iPhones, and I've always wanted one. My mom then told me that I was getting one for Christmas and to pick one out.that's where I ran into trouble because, which one should I get? She told me that I'd have to pay for half of it (it's $200 total) if I get the 5s, which is odd because she's probably getting my brother an xBox and a Kinect without him paying for any of it, lol. Anyway, I was wondering if it is worth it to pay an extra hundred dollars for the 5s. I mean, I know it's good and all, and everyone has told me to get it instead, but should I really? I'm also paying for the plan with money I have saved up for a while and then all of my birthday money I get when I turn 16 next year. But I will probably get a job then so that I can better fund the bill. Back to the iPhones, I like the design of the 5s better, it looks much less childish than the 5c, or at least it does online. I'd also need an Otterbox if I got the 5s because it is more expensive and breakable. I'd like it, but I just don't know. I could put the $100 on my Christmas wishlist for my extended family, but I'd also like the Sims 4 (!) which is somewhat expensive and maybe a new pair of TOMS because my current ones have a few holes in the toes. So anyway, sorry this was so long and rambling but which iPhone do you think I should get?

I would say go for the 5s the 5c is just the iphone 5 in a plastic body and the $100 difference is not big enough