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Because at least Firefox on Android allows use of Flash and Adblock plugins. I know there's root varieties of adblocking but they cause too many issues and isn't as elegant. Adblock Plus is still king. Chrome on Android really isn't mind-blowing, especially since snubbing Flash and banning ABP and similar apps on the Chrome store.
Safari on my iPhone, it's still the fastest all around for iOS.
I also use Dolphin HD on Android from time to time because it's damn fast, and seems to handle some sites with Flash a bit more smoothly...but it has some crashing issues.