It depends on what type of camping you do. I camp year-round, so a 4-season package was a must. Don't know if Airstream is 4-season rated, (heated underbelly to keep tanks from freezing, double-pane window).
I went with a Lance, due to lighter weight than anything else I found that had an enclosed, heated underbelly. And, the floorplan fit our needs. Lots more storage than we use, 45 gal fresh tank (mostly boondocking). Room for two 160w solar panels on the roof.
If you always camp with hookups, or don't need a lightweight trailer, you have more options. But, we love our Lance, after comparing to many other trailers. Our needs may be different than yours, so just because we felt the Lance was right for us, does not mean it is right for you.
Have fun shopping!