Samsung Galaxy S3 or iPhone 4s?

[HJ]

I was recently looking around and found a deal on Kogan as I need a new phone.
It's basically between a Samsung Galaxy s3 16 GB with 1 year warranty new from Kogan for $399.00
OR
A Brand new iPhone 4s 16 GB (new with warranty, etc etc) from Kogan for $570.00
I know price wise the Galaxy is a wiser choice but price isn't a huge deal here.
I use Instagram, Facebook, Apps, Emoji, Hotmail, Camera and other features of my current iPhone 3GS a lot so I just wanted to hear other people's opinions.
Does not seeing emoji on Instagram become annoying?
Which has a better camera?
Or even which model you like or if you have converted.
Sorry for such a lengthy question
I have just googled it so many times and no one has really answered it in a review!!
I want personal experiences, not just recounting specs Thanks
Sorry I forgot to add, I'm not from the US I'm from Australia! So phones here are full price and plans aren't an option to me
Sorry I forgot to add, I'm not from the US I'm from Australia! So phones here are full price and plans aren't an option to me