If you look the whole air awning concept properly, the new Isabella Cirrus at around £2400 is probably the best. I say probably because it is Isabella, but as yet is totally untested. Its a brand new venture for Isabella under the Isabella name, however, under the Isabella banner, Ventura have been doing air awnings for some while now. Strangely, you dont see many around on campsites.
Moving down in quality you have offerings from Dorema and Bradcott in the same cost bracket as Kampa and Dometic (Kampa), Vango and a couple of others. There have been issues with Kampa/Dometic expolding air beams, and I speak from experience of that one. These can cost anywhere from 1k to 2k, and I would suggest if you are prepared to spenad 2k in this bracket, find the extra for Isabella.
At the other end of the scale, are a mixure of decent quality lightweigh ones, and to be fair some proper garbage too. These arent all bad, but you have to take them in context, none of them purport to be top quality.
As for the original question, the Isabella and others whilst not being "full awnings" do have annexes and extensions that can be added and I would have to say make them more usefull, for example when you dont always need the full awnings.
If its because of the seal to the caravan that you want a full awning, the Isabella offerings seal very very well so I wouldnt let that put you off.