1)Apple iPhone 5 over Galaxy S III:
*Thinner, lighter, more compact
*More impressive build materials
*Sharper screen with better sunlight legibility and more accurate colors
*LTE on all models

2)Samsung Galaxy S III over iPhone 5:
*Bigger, higher-resolution screen
*NFC connectivity
*Standard USB port for data transfer and charging
*microSD card slot for (cheap) storage expansion
*Mass storage mode, USB Host functionality
*Native Google Maps
*2GB RAM in some versions

3)Design and build quality
*Winner: Apple iPhone 5(The iPhone 5 handles like something you bought from a jewellery shop and it looks way better than the Galaxy S III.)

4)Display comparison
*Winner: Samsung Galaxy S III(bigger screen advantage)

5)Battery life
*Winner: Tie

6)Telephony
*Winner: Samsung Galaxy S III(comfortable win)

7)Messaging
*Winner: Tie(Personal preference)

Video playback
*Winner: Samsung Galaxy S III

9)Audio playback and audio quality
*Winner: Apple iPhone 5(narrow margin)

10)Still Cameras
*Winner: Apple iPhone 5 (by the narrowest of margin)

11)Video cameras
*Winner: Tie(iphone5 almost lost)

12)Photo viewing
*Winner: Tie (personal preference)

13)Web Browsing
*Winner: Samsung I9300 Galaxy S III(clear margin)

14)Mobile Gaming
*Winner: Tie(tilting slightly in favour iphone5)

15)Maps and Navigation
*Winner: Samsung Galaxy S III

Conclusion

Final words

Those hoping for an X-is-better-than-Y-period-! answer will be disappointed. The way the crowd at a boxing match will feel about a win on points instead of a knockout. Like someone running for office wins debates to lose an election.

Let's not get carried away though. It's just phones. Worse yet, they're soon to be last season's phones. Yet, we all vote for them with our hearts, minds and, ultimately, wallets. So, which one is better?

We know you look to our conclusions for buying advice and some kind of closure. We don't think you need to look any further. Just this once, go a few pages back. Each individual category was won by either the Apple iPhone 5 or the Samsung Galaxy S III.



It's up to you to go over the ones that matter to you and tally the score. And don't be swayed by popular opinion. The smartphone is probably the most personal thing you own (it knows your friends, has your photos, goes everywhere with you), so it's up to you to decide which one is best.

Before you look at the price of either phone, there's one last thing to consider - how invested you are in either ecosystem already. For example, you may have iPhone accessories worth a few hundred dollars (though the iPhone 5 pretty much wiped the slate clean on this one), or maybe various apps you've bought and don't want to lose.

That leads us to price and the difference is by no means negligible. SIM-free the iPhone 5 is probably the most expensive smartphone on the market right now, topping the Samsung Galaxy S III in Europe by almost 200 euros.

But then, resale value is another thing you might want to look at, after all it won't be long before the next Galaxy S and iPhone generation is out, tempting you to upgrade. Of course, you can easily use the Galaxy S III and iPhone 5 for a couple of years and not feel too far behind the flagship du jour.

Some would say that the most damning verdict for the iPhone 5 is that it's trading blows with a smartphone that came to the market 5 months before it, instead of wiping the floor with it. Others will point to the fact that the Galaxy S III took three months to achieve the sales numbers that the Apple flagship already has.

In the end, the iPhone 5 vs. Galaxy S III argument comes down to portability vs. screen size, LCD vs. AMOLED, closed vs. open, Apple vs. Samsung. The latter have been in and out of court for a while now but this particular dispute won't be settled in a courtroom. You'll be the judge, so the winner doesn't have to be the one with the better lawyers.


Source: http://m.gsmarena.com/iphone_5_vs_galaxy_s_iii-review-837.php

I've always thought the samsung galaxy SIII is better in terms of value for money.