Which is more worth it? And iPhone 5 or a 4s?

I'm Guna get an iPhone in the next year or two, I wanted to know which one was more worth it in terms of cost, and what's the differance. I've had a. Hard time getting a direct anwser when looking it up. I'll probly use t mobile. How much would it cost if I got unlimited texting calls and Internet all the time. Also I heard that the iPhone 4 is free right now is that so. And what are the differnt plan options.

A year or two is a long time. Decide then.

Ok so the difference in between the two items is on the iPhone 5 it has a larger screen, on the iPhone 4s it has a smaller screen and on the iPhone 5.i'll break it up in categories:

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Camera: iPhone 4s: 5 megapixel iSight Camera iPhone 5: 8 megapixel iSight Camera
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Price:

iPhone 5 16 gb - $199 32 gb - $299 64 gb - $399

iPhone 4s- on Amazon 270.01 in verizon
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Time:

iPhone 5 - iPhone 4 (or 4s)
Up to 8 hours of talk time Up to 7 hours
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Size and Weight:

iPhone 5- iPhone 4 (or 4s)
Height 4.87 in Height 4.5 in
Width 2.31 in Width 2.31 in
Depth 0.30 in Depth 0.37 inch (9.3 mm)
Weight 3.95 ounces Weight 4.8 ounces
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Battery and Power:
Standby Time: Internet use: Internet use: Standby Time:
iPhone 4 or 4s iPhone 5
iPhone 5 Up to 6 hours on 3G 8 hours on 3G iPhone 4 or 4s
Up to 225 hours up to 14 hours on 2G 8 hours on LT8 Up to 300 hours
10 hours on Wi-Fi 10 hour on Wi-Fi
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Sorry if to smart lol go from picking there.