Android will offer you tons of customization and features that the iPhone will copy in the next 2-5 years. The only reason the iPhone is still relevant in my opinion is because Apple marketed it so well. It's a bad device with a closed up OS, extremely limited features, and stuck in it's ways. Siri isn't innovation, it's just a Google "I'm feeling lucky" search that responds when you ask it stupid questions like 'will you marry me' with pre recorded responses.
But, I do have to say, the iPhone's greatest flaw might be it's biggest strength, and that's it's super simplicity. Literally dumbed down so that a 5 year old can pick it up and start playing Angry Birds right off the bat. Personally I used an iPhone for the past 3 years and decided to get a Galaxy S2 Skyrocket this year and my god was I amazed. A lot of my friends complained that they had trouble understanding the OS compared to iOS, but I didn't have any trouble with it at all.
TL;DR: If you want something that plays angry birds, makes phone calls, and that is easily recognizable on the street, iPhone it is. If you want a smartphone that'll show you the status of every online service you've subscribed to when you unlock it, and be able to customize everything about it, S3 it is.
Posted from Samsung GT-P1010
