mobile

I know, I know - this is a noob question, guides have already been posted, etc - but information is scattered all over the place, and the internet is littered with "what worked for me" type guides, and I'm just looking for a quick response.

Here's the 2 guides I have found so far:
EDIT: It looks like i can't post outside links, but have found 2 guides. Both are on reddit, and one ends in:
/nexus6/comments/2ywu1m/guide_to_flashing_51_factory_image_without_wiping/
The other:
/nexus6/comments/3028i9/guide_how_to_update_to_51_and_keep_root/

Both of these are very different methods, it seems. My phone is unlocked, rooted, encrypted, and has 5.0.1. It would seem like the easiest thing to do would be to unroot, apply the OTA update, the re-root using CF-Auto-Root - but a forum post said that didn't work, it needs to be re-flashed.

I'm just looking for which of these methods would be best for me at this point. I want to keep root, and not lose my phone's configuration in the simplest way, preferably just using the OTA update, without re-flashing.

Thank you, and I apologize for asking a question that has already been answered. The problem is there are too many different answers, and I'm not sure which one to go with.