Most all of the a/m decals are good to great quality consistantly. They need to be to stay in buisness, we thrive on and demand it. I have had a bad sheet a couple of times, mostly due to old age. They are usually (not allways) better than kit decals in quality of printing and their reacting to setting solutions. You listed the best known and the largest two ( aeromaster and superscale), but I have used others with just as good results.
Best a/m decals I have used?....... Yellowhammer........Super thin, no setting solutions needed, conformed to all recessed detail with no help, white ink very opaque dark blue didn't show through and it was in the unit markings I wanted (most important).
Best bang for the buck, I think it's Sky Models Decals. 20+ unit markings on one sheet for about $10.
Hope it helps
Drew