I liked Bert best, too. As a child I was always very mature, and seemed a little "boring" to kids who weren't very nice. I never got in trouble, and was always into a book. Oh, I still played and got really silly, the totally unscripted silliness of our play was total hilarity with all our action figures mix3ed together and the plots so goofy and complex... But, I always thought of the Ernie part of me as what I'd have if I had a little brother; aas I've said I always thought B&E were brothers.
As to the connection w/Aspergers, I don't know if the origianl poster will post b/c (and I know this from a couple online friends with it, plus I was never diagnosed but it's possible I have a teensy bit) he or she might not know how to explain it himself or5 be all that comfortable explaining it, but:
People with Asperger's exhibit some autistic traits but not all. They don't have the learning difficulties but really tend to "think outside the box" sometimes and can be very creative. (Michelangelo was one, so was an inventor named Trevithick who did some work early int he Industrial Revolution.)
Asperger's Syndrome causes people to cling to fictional worlds sometimes because they are more comfortable to them for the reason that the characgters always act the same, you know how things are going to be. It is hard for someone with Asperger's to make friends because they cannot read social cues, etc., very well., and so they are often worried they are doing something wrong b/c they don't know how to tell if they are. (Hence the poster apologized and you didn't know what he or she was apologizing for in this thread.)
Therefore, I would say the reason they are so special is one or both of the following:
1. B&E were a fictional duo that the person fixated on growing up, like they had alltheir skits memorized and stuff; and/or,
2. Ernie, like a child, can get on Bert's nerves sometimes. He can't seem to sense when Bert wants to be left alone/is busy/etc.. And yet, Ernie and Bert remain good friends despite this problem. Such a thing might have given the poster much more confidence to attempt to make friends/deal with problem situations because they saw Ernie do it successfully.
That sound about right?