Yes well one thing to consider, especially with German markings, there are lots of variants, many not so well executed in field modifications to the crosses and fields that decals tend to ignore. I've often thought decal a little too precise for such applications where often paint/dope application, quality, and such make quite a differing effect, fading, peeling, thin coats etc. Close inspection of many pictures show some paintwork isnt that well carried out.
Heres one I tried to get such an effect on wit decals and paint

Keith