I have both of them a shield (S3, it comes bigger on every new version) and a sword (iPhone, it seems will come longer in the future XD)..and it depends where are you staying if you are not american Galaxy S3 comes with QuadCore processor, which make everything faster..while iPhone5 just relay on DualCore, but for North America, S3 comes with DualCore as well, just faster speed and bigger RAM..Well it's really depend for what you need. For me I'm a tech maniac, I much prefer S3 as its based on Linux, and I can do whatever I want. iPhone5 to be honest, I just like the iMessage feature. Hmm maybe I like the smooth iPhone UI as well..but thats it. My personal opinion is s3