IPHONE 4S VS IPHONE 5? Is multitasking is available in both iPhone?

Why should i buy IPHONE 5 INSHED OF IPHONE 4S?

coz 90% features are same… So what special in ip5?

any disadvantage of Iphone4s like battery life or loudspeaker or multitasking?

I suggest you compare them at apple.com
apple 5 has faster chip, 4" screen not 3.5" screen.
both have multitask.

The 5 of course is the better phone. Faster processor, more RAM, better graphics, slimmer, bigger display etc. Also in the long term it would still get iOS updates where the iPhone 4S & previous iPhones would have stopped.

Yes the 4, 4S & 5 all have multitasking

Excellent question about which is best both of them. According to me, both are best in used for users. But in other-side that totally depends on your requirement and your budget.
And other thing is multitasking is available in both iphones. But i suggested that iphone 5 is best for you. I have also lots of free application for iphone 5. Try to following free application link for know your perfect love for those valentine day.