I've been an Android user since the OG Droid, and had the Droid Charge, Galaxy Nexus, SGSIII, back to the Galaxy Nexus, my dad's Droid DNA, my sister's Note II, and back to the Nexus.
I finally bought an iPhone.
Not that the Droids are inferior devices. I find that the bigger screens suit my taste more, but after I got an iPad last year, I found myself using my phone less and less. I had used the phone for movie watching on the train to work, reading books, and surfing the web. The iPad quickly replaced those activities, and in a much better way. iBooks is the perfect ereader. Jailbroken, the iPad plays .mkv files flawlessly. Web surfing, well the iPad's bigger screen is going to trounce even the Note II unless I want to be extra private, which I usually don't care about unless it's banking info.
As I used my Android device less and less, I found myself wanting to have my media consumption click together. After all, after my 3rd PC bit the dust, I finally bought a Mac. I guess I just decided to go with the iPhone in order to have everything more streamlined (being able to text using my phone number straight from my Mac, etc.).
I couldn't be happier. Plus, I think I got sick of all the Rom'ing and kerneling and all that. I just want a phone that works great, doesn't go into random reboots, and doesn't ask to have its ROM changed every day.