What's better, the Iphone 4s or the Iphone 5? Opinions please

Present idea for my 19 year old sister

She wants an Iphone but I'm unsure of which is better

Although the 5 is newer I have been advised by numerous people with both makes that the 4S is preferred (which I'll gladly go with as it's a much cheaper deal)

What are your opinions on this Iphone users? Which would you recommend and why?

Thanks!

Added (1). @RICHARD… Pretty useless answer. Size isn't the issue, it's what you do with it that counts. She's a working adult, why would she want a big phone?
Can intelligent people only answer please.

Added (2). @ScσττRΛSC³… Eh, doesn't appear to be much different to me… I know many people who have upgraded and then downgraded again because they much prefer the 4s. Also on review sites like amazon, the 4s is much preferred and higher rated. The link you sent me simply gives the differences, not preferential opinions. But thanks for your answer.

5 because its bigger and better end of

I think you've been advised by the wrong people. The iPhone 5 is the better & definitely the more preferred of the 2.

http://www.gsmarena.com/...hone2=4910
see for yourself.