If you want to carry on a conversation with your phone then use Siri. If you want to actually get useful information then use Google Now.
since you can DL Google Now on the iPhone ...do you prefer it over SIRI?
Google now blows the competition out of the water when it comes to accuracy and dictation. That is what is important to me so I go with Google Now.
ROTFLMAO. Stop it, Stop it, I can't breath