For me, both are great trailers. The only reason I bought an AF was because I got a great deal on the trailer. If I would have found a Lance for the same deal I would have bought the Lance.
I really like my AF because it's very heavily built. I don't have to worry about things like frames breaking or cracking or garbage like that.
I really hate my AF because it's very heavily built. I have a 3/4 ton diesel truck and I had to bag it because the trailer had so much tongue weight and was so heavy.
Just because the Lance is lighter does not make it a worse unit. Airplanes are very light but yet strong. After I bought my AF my friend bought a Lance. His is a very nice trailer also.
Bottom line for me is both are good trailers. Buy what he wife likes. ;)