iphone 4 or 4s ????????????????????????????

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okay guys i need a primary phone so help me choose one from iphone 4 or 4s .. only these two are the options so please no new options at all ...

okay so i really know in depth differences between these phones please don't bring up specs here,
i know its single core vs dual core , 5mp vs 8mp etc

for what purpose i use my phone (to help u suggest me a phone)

basic calling

Whatsapp

Facebook

Instagram (its a photo sharing app so i should need a camera that should get my pictures right so recommend 4s's 8mp only if iphone 4's 5mp camera takes real shitty pictures )

web browsing ( like Google, gsmarena.com , cnet.com , youtube ,amazon not too heavy browsing )

mail (basically should run gmail's app smoothly)

music

weather and stocks update

no games at all

overall should run the IOS smoothly (i know ios is faster on 4s but i am talking about smoothness )

okay now i can even get iphone 5 but i don't like its design over 4/4s and second i just need a basic phone that should run my apps n stuff smoothly
and i am confused between iphone 4 and 4s because if 4 can do my work then why to spend extra money on 4s O

what you guys think which phone will suit me the best ?
LMAO ROFL @zoe i ain't accepting your answer A) you said 4s is bigger and feels better lol dude they are exactly the same in size n feel, get your facts right -_- and B) i don't need siri as such