I'm leaning toward the Note 4 myself.... my upgrade is ready, but I can't decide. Further, my Note 2 isn't all that bad to tell you the truth. Kinda nice to cruise along without jumping into a new contract.
I have the typical worries about the iPhone mentioned above: fixed battery, no SD card, minimal customizing
In addition, I don't like the lack of a real folder / file system. That's just weird.
The need for a special, proprietary charger cable is also a hassle.
And about the battery... something I just noticed: It's not just that the Note has a replaceable battery...and that this battery lasts a long time. In addition, the Note 4 replacement battery (Anker) is REALLY cheap!!!
For $25, you can get TWO high quality Note 4 batteries AND a battery charger.
http://www.amazon.com/gp/product/B0...ag=hawk-future-20&ascsubtag=UUacUvbUpU4222262
I'm not sure when batteries got so cheap, but my one spare Note 2 battery was $45 if memory serves.
I do use an Apple computer, and I can see the possible advantages of going with the iPhone for better compatibility, but I'm noticing no problems or obstacles working with Android and Apple together.
If Samsung would kindly make their Touchwiz a bit leaner, there would be no reason to even consider the iPhone.