I've had my Nexus 4 for a month now. Came from several iPhones so I can comment on the differences and why the N4 won out over the iPhone for me:
1. Unlocked out of the box: No jailbreaking. No unlocking. No hacking required. I can tweak it exactly how I want it with no need to do anything crazy out of the box!
2. NFC: I do a bunch of NFC payments with my tablet (Nexus 7). I live in an area where a ton of places have NFC/PayPass payments! It's so easy and secure. The fact that no iPhone offers NFC is a major downer. I also transfer a ton of files and links and photos using NFC.
3. Wireless Charging: You have no idea how handy this is until you try it and then someone takes it away, lol. I'm not going back to searching and fumbling for cords. I just drop this thing on the pad and it charges. I pick it up, do what I have to do then place it back down. Charges. My battery stays perpetually topped up without any thought or effort on my part whatsoever. Ease of use at its finest!
4. Stale-ass, tired OS: I'm tired of Apple's stale-ass OS. It looks the same as it did when it debuted in 2007. Having owned iPhones for YEARS, I'm done. Boring, plain, ugly, cluttered and uncustomizable. I can customize my N4 in so many different ways without hacking. I can change it to suit my mood or match my outfit.
5. Faster Performance: I've had the iPhone 5. I now have an N4. I don't care what any benchmarks or fanboys say. In MY real world use, my N4 feels snappier, faster and more responsive than my iPhone 5. Period. (YMMV depending on your settings and the programs you put on it but mine is behaving faster than my iPhone.)
6. Bigger screen: Some people like smaller screens. Some people like bigger screens but for me, the bigger the better! I'm tired of squinting at a 3.5-4" screen. Every fraction of an inch in screen real estate counts in my book.
7. Open ecosystem: I'm tired of the beautiful but walled in garden that is iOS. I love the huge Dev community of Android. The things they cook up are amazing and would be neigh on impossible with an iOS device.
8. iSheep Mentality/Uniqueness: I'm tired of the iSheep mentality. The mindless drones carrying an iPhone. You know your **** is played out when everyone and their 80 year old grandmother has one. The iPhone is played out! Time for something different. Time to "Think Different". Time to move onto something bigger, better and more unique... Time for a Nexus (4).
These are just a few of the top reasons I choose the Nexus 4 over the iPhone. These reasons might not resonate with you. You might have your own reasons. Great. But these are some of mine and I couldn't be happier with my choice.
Sent from my Nexus 4