Trying to choose a model

I've recently been looking for a good phone to join my parent's AT&T family plan. I've tried out the Note 4 and really love it, I just don't like the Samsung bloat. I want to buy a phone in about a month, and my budget is around 0. I searched on eBay for an unlocked Note 4 and found that there a lot of listings for AT&T unlocked phones at 0. At first, I though this would be great. It's not expensive, it's a great phone, etc. But then I looked at the XDA Developers forum and found a mess of different versions. After looking around, I'm pretty disappointed to find that the N910A is not rootable, which is a pretty big deal for me. I can deal with Samsung bloat if I can use a root disabler or something. But if it's not even rootable...

Anyway, I just want to ask a few questions regarding the Note 4 models.

1) Is the AT&T Version really not rootable? Is it just more difficult? (if yes, does anyone know why not?)
2) Would the T-Mobile version (N910T) work if I could find a nice unlocked one on eBay?
3) Will the pre-installed ROM update to Android M when it's available?

I hope these questions make sense.
Thanks in advance!

Help me choose a phone

Alcatel One Touch Pop C7 vs Vodafone Smart Prime 6. I'm looking to buy a phone and I ended up with those two. I'm more inclined to Smart Prime 6 but i would like more opinions. I'll use the phone for mainly gaming and youtube

Newbie: Help me choose a safe kernel (read post first)

Hi There!

Before redirecting me to Chasmodo´s Which kernel is safe/unsafe
safehttp://forum.xda-developers.com/showthread.php?t=1857556 please notice
that I am a newbie and I can´t understand all the stuff there. So stating clearly that the thread is useless to me and that no one seems to respond to my questions there I have just decided to open a new thread in search for the solution. So maybe any expert around here may drop me a hand. Let´s get to the point.

I have a rooted ICS 4.2.2 ROm with AOKP installed. My Kernel version is 3.0.85-NX-Kernel_1.4.1 neobuddy89@ubuntu #1
N7000XXLT3
STUNNER VERSION 2.7.13

The thing is that I´d like to install a ICS based stock rom. I have downloaded the latest FOP Rom from Sammobile for my country. Now .......I read here in the forum that some kernels are unsafe to flash from.....so I am in Panic!!
My first question is.............. which safe kernel should I download for my cell phone?. I don´t understand all the numbers and characters here for the different versions. Please let me know which kernel iI should download!.

Kind Regards,

Medved

Would you choose to root your phone or not?

Many of my friends root their phones to get more apps with less restrictions. But there is one problem coming along with it, the device will not be guaranteed to be repaired once it's rooted. So, I haven't rooted it until now.