Which should. I get? Why?
Yes I understand I'll be getting biased responses.
You didn't state what history you have with either platform.
As for me, I was all iPhone since it came out in 2007.
Last year the 4S didn't wow me as much as when the 4 came out but I went for it anyway. Possibly due to Siri, which I think so was mostly an artificial limitation for the 4.
Then came the iPhone 5 and I just could not pull the trigger on it. But I have been wanting a larger screen since before the 4S came out (loved the supposed "teardrop" iPhone 5 that was all over the net). I was disappointed that the i5 was basically a slightly stretched 4S. Yes I know it is thinner but I never complained about the size of my 4, or 4S (or prior). Plus, this time there was no artificial limitation imposed on my 4S: I have just about everything that is on the i5 aside from the stretched screen. So there was nothing compelling that woud make be get the i5 and especially to extend my contract for it.
So I ordered the N4 and should get it today. I don't know yet how I will like it compared to my iPhones but I will say I am tired of waiting for iOS jailbreaks so I can use my jb apps that I paid real money for. I'm not a "themer" but I do like extra features that Apple does not allow natively (MyWi, iBlacklist, BiteSMS, etc.).
So far I am liking what I see about the Nexus 4. And for the price, with no contract, there was little risk. If I abhor it I am sure I can sell it for what I paid, if not more.
Michael