Which stock ROM to use??

Hi,
I've used my Note 1 for quite a while now and have tested various custom ROMS on it. I now want to take it back to stock ROM and from what I can gather it should be pretty simple to accomplish. However I have a couple of concerns:

1. There are so many stock ROMS out there... How do I determine which one I should use? Does it matter or will all work?
2. I read in a comment somewhere that I should not "downgrade" to a ROMS with an earlier Android version. Is this true?

I am currently running Mokee version MK44.4-n7000-141219-RELEASE with Android version 4.4.4
Baseband version N7000XXLT3

Hope you can help!

Thanks!