which cell phone do you think is the best between Iphone and Galaxy S2

Hello guys. 

It's nice to meet all of you.. The reason why I put this one, I am really itchy to know which cell phone is the best Ipone 4s or Galxay S2!.. 

I have seen one interesting article that, as you guys could know, Galaxy S2 is the first cell phone when it comes to having thousands of people use it in Korea. Interestingly, even in US, Galaxy S2 is the first most selling phone there are tons of people using IPhone though. 

I'm sorry to forget to let all of you know who I am.  I am one of Koreans who are desperate and needed using English and I am just curious about your answers.

Don't hesitate, and just give me your opinion!! Thx all of you!

Ps. I've used two of them but I cannot still figure out which one is the best!