People have asked us about the insulation in the Airstream on a few occasions. Since we have not owned a ton of other trailers, it is hard for me to compare with others. But I could comment on how our experiences have been having traveled through various weather conditions in ours. The Airstream is also kind of unique in that the exterior panels of made of aluminum which is going to conduct heat better than fiberglass. There will also be differences depending on the model of Airstream you have. Some like ours, have the interior aluminum skin exposed as opposed to being lined with fabric which I would assume adds another layer of insulating quality to it.
Here is a short video I shot of the inside of our Airstream to give you some idea of what to expect.