Google Search for iOS
PRICE: Free upgrade for iPhone, iPad, and iPod Touch at Apple App Store
PROS: Voice-enabled search feature often outperforms Apple’s Siri; new Google Now predictive personal assistant automatically shows convenient information, , including traffic, weather, and sports.
CONS: Lacks features of Google Search for Android phones. Requires an active Google account for best results. May reduce battery life.
Siri personal assistant
PRICE: Free for iPhone, iPad, and iPod Touch
PROS: Pioneering iPhone app offers solid voice-enabled search features.
CONS: Often slower and provides less useful information than Google Search. No predictive features.