Choice Between IPhone4 and Iphone 4s?

I kinda want to buy an Iphone but can't really decide, either the 4 or the 4s but I was kinda wondering which one of them has more available(Free) apps bc my mom's not gonna give me my credit card yet and fyi i'm 14 years old.

The 4s will be able to run more of the up to date apps

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