I went to the UN in WV a few years ago. IMHO, it was well worth the trip if only to put faces with names or handles (and avatars).
Had it not been for wanting to experience at least one MOA (just cuz), I prolly would have gone to NH. Not that I didn't enjoy the MOA... but that is really, what it is...a huge buttload of people. (good thing nearly all of them ride relatively quiet bikes). Just the thought of thousands of bikes with loud pipes...makes my head want to start hurting
Despite the thousands at the MOA, I still managed to meet and spend time with some of the fellow board members that were also present at the MOA (you know who you are). Good times, hearing the stories of epic journeys over some darkstar porter... made my 1st MOA experience that much more enjoyable.
Having experienced both, I can say that they are not even close to being comparable. Night and day, apples and oranges, (you get the idea).
At my first (and only) UN. I met a bunch of folks that were there to see their friends and meet new ones. It really didn't matter much that I didn't know many people by the end, I had new friends and countless "if you are ever in my neck of the woods invitations". Thats cool.
At the MOA, SOoo many people... sure, I met some folks but I can't say that I walked away with new friends...
All of this to say that, I missed seeing/hanging out and meeting many more new friends.

I heard the rumor about the next UN in the sierras.... I'm juiced! I can't wait. Don't think I'm gonna miss that one!