Brian is looking to upgrade his cellphone. He's thinking about the Samsung Galaxy SIV, but he likes Siri on the iPhone.
Leo says that Google's voice recognition is now better than Siri. It's more reliable and robust. There's also the HTC One which is a good phone to consider. So getting an iPhone for Siri isn't a good idea.
The Galaxy SIV is a great option, but Leo also says not to count out a Windows 8 phone. The Nokia Lumia 920 is a great phone if he's a Windows user. There's a few things that it can't do, such as Instagram (yet).
For it's simplicity and clean interface, though, the iPhone is ideal, especially if he has family that uses them. It makes sense to get what they have, so they could help him with it. At the end of the day, it comes down to his personal preference.