I'd have to say the iPhone overall has been my most favorite Apple device. The desktops/laptops are nice to use and the iPad is a great distraction device, but the iPhone has changed my life since the first day I had a 3G. I've upgraded each new entry since (4, 5, 6) and each iteration builds on a solid foundation. I'm not gonna lie and say there aren't nice android phones out there that compete, but to me, the iPhone rules them all!