The default browser for iOS is Safari whose default search engine is Google. Does the comparison hold true still?
Up to the user. On Android, the user does not even need to sign in to an account to use the device. On iOS, you must sign into an Apple ID (which, unlike a Google or Facebook account, can never be deleted). Until very recently, you had to provide a credit card to download any apps at all onto your iPhone. This was never the case on Google Play Android devices.