I have had the Note 2 and 1st and second gen Nexus 7 4G versions, currently using N7 LTE as my phone...no doubt, get the N7. Few reasons...
There is absolutely nothing like having one everything device, you will want a tablet too if you get the note (I have a windshield mount and this makes the best GPS/hands free phone/radio with aux input. The note is still small enough that it's not a good in-car device)
As someone who uses their device a lot, AMOLED burn-in drove me nuts and it only took a year.
If you get dumped on by one carrier, you can change in a flash, Vzw, At&t and Tmo + all their MVNOs
$15 unlimited data from Aio, anyone?
A tablet plan can save you thousands over a smartphone plan in just 2 years.
TMo will have it, unlocked, in November for $0 down and $16/month...but you don't even have to buy their service to get that, the first 200MB are free.
If you break/lose the N7 it's only $350, I cried when I spilled water on my Galaxy
Samsung is a hardware company, their goal is for you to buy a new phone every year...Google is a software company, their goal is to get you addicted to Android, the more you use the tablet the more money they make. See how their interest in you as a consumer is completely different? Who do you think cares more after your 14 day return period is up?