SM-P900 (wifi) with Lineage and stock ROM

[dutch_in_seattle]

I'm going to pick up a Note Pro 12.2 (SM-P900, wifi only) from Craig's List tonight for $150. It'll be my secondary device, in addition to my Galaxy S2 9.7" (SM-T813). I'll use it mostly for media consumption, but I'm also excited to experiment with this thing. I have a couple of questions:

1. I want to install a custom ROM. If I used Lineage, which version do I download? Based on what I've been reading, it seems that 14.1 is my best bet (1awifi). However, the builds are all nightly, not stable: https://download.lineageos.org/v1awifi . Do these builds tend to be pretty stable? Once you install such a build, how do you update it without having to start from scratch again? Also, is there a good primer? I'm not new to installing custom ROM, kernels, etc. per se, but it's been a while (not since the HP Touchpad---remember that one?).
2. Are there any other custom ROMs and/or kernels that are worth trying for the SM-P900?
3. I want to download a stock image, so I can always revert back to that. Which one do I download for the U.S. version of the SM-P900? Pages like https://www.sammobile.com/firmwares/galaxy-note-pro/SM-P900/ don't specifically list a U.S. image. Do I use the one for Cellular South (XAR)? Or the one for Canada? Does it matter? Is there a good refresher on this, too?

Thanks!
--Ron

 

[dutch_in_seattle]

I see I've been a bit lazy by not reading through all the information already on this forum. Apologies!
I'll spend some time going through what's already here and post any follow-up questions.

The only question that I still have is where to get the official stock ROM for the U.S. SM-P900 version.

Also, one more question: What's your preferred custom ROM: Lineage 14.1 or Resurrection Remix 5.8.5?

--Ron