Go for 5s because you won't have to update it for like next 2 years. 5s will easily support upto ios12 If it comes out. Plus, iPhone 5s' processor is more than twice as fast compared to iPhone 5.
If you are low with budget, then Iphone5 is a good option to with, however, now ther is already Iphone6 launched so you might go with that with is comparatively high on price with wider screen.
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