system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What makes the Samsung Galaxy S3 better than the iPhone 5?

I was reading the initial reviews of the iPhone 5 launch and reviewers seem to be of the impression that whilst the iPhone 5 is good, it doesn't have the "knock out feature" that makes you want it over the S3. Why? And what is this so called "knock-out feature? They seem like pretty much the same phone to me and currently with today's technology, it seems fairly difficult to innovate any more on the current smartphone technologies.

EDIT: although i considered this marked feel free to debate AND also I was asking for the difference in the actual phones not the OSs.
gpt
The Galaxy SIII has NFC -- it can respond to rfid cards around it to do different things (you could have one in your car, when you set your phone down in your car it automatically opens up pandora and plays your favorite station, and auto replies to texts that you are driving, for example).  You can also pay at some checkout counters by just tapping your phone on a pad.  

The front facing camera has a feature that watches for your face -- if you aren't looking at the screen it will turn off the screen, if you look back at it the screen will come back on.  If you are in a text conversation with someone, or looking at their contact info, holding the phone to your face will call them.  You can have videos hover over other apps you use so you can watch them while doing other things.  

And to top it off, the S3 has double the expected ram.  

So far the iPhone 5 looks like a slightly reshaped iPhone 4, though we may find out they have something cool in store.