ok, it has a larger, better looking display, I can swap our the batteries ( which in my personal case last longer than the iPhone battery does to start with ), it fits better in your hand, its more durable ( glass screen on the iPhone likes to shatter when dropped ), it has better hardware, and a better operating system, It also supports LTE, the iPhone does not. So its faster, stronger, and just plain better.
My Galaxy S3 has maybe half the battery life of my iPhone 4. Anecdotally speaking, if I leave the fully-charged S3 overnight without any apps running, the battery will have dropped about 20% or so by morning (7 or 8 hours later).
It does depend on the user, for me my S3 has been getting better battery life than my 4S ( yes, I carry both, the 4S is a work phone given to me by my employer. I have to carry both at all times + Zune. You think Note users have pocket problems

)
The hardware is technically faster and the extra RAM is there as well. But Android isn't as efficient with its resources as iOS is. Simply put, Android phones need better specs to maintain the same UI performance as its less well-specced iOS competitor.
Needing better specs or not, I feel that ICS and JB are far far ahead of iOS.
I do notice that when I load up my home screen with widgets and icons, touchwiz gets pretty laggy, even on this powerful hardware.
I can't speak for your user experience, but for me, my S3 is so far ahead of my 4S. ( If you knew who I worked for, the fact that they give out iPhones as well as blackberries is hilarious. )
G51989, I think it's fine to state your preference but I think saying that the S3 gets better battery life, for example, is untrue. Unless you use Juicedefender, you're not getting anywhere near the battery performance that iOS has. And Juicedefender has a lot of drawbacks, which makes it an unfair comparison with iOS.
For me, it does, and yes I use Juice, and iPhones have plenty of third party apps for pretty much everything as well, so I think its a fair comparison.
I'm the kinda guy who buys the best tool for the job, like when I got my 3GS, I thought it was the best phone you could get, but now I think the S3 is the best phone you could get, so I got that. I see hardware and the OS that runs on it as nothing more than tools.
If apple would actually make new hardware, with an overhauled iOS thats great to use, ands a bigger screen, I'd be all for buying one.