So far on this website I have only seen pheonix graphics mentioned for decals.
www.stencilsandstripes.com has Dodge graphic packages available. The 77-78 Macho package is double the price of what phoenix graphics offers, but it comes with the complete tailgate decal, whereas phoenix just gives you a yellow stripe.
From those I know in the body and paint who have purchased from both companies, it sounds like stencils and stripes comes out ahead on quality as well.
I cannot comment on that as I have never compared, but I bought the complete set from stencils and strips (not on the truck yet) and they look good so far. They did an amazing job on the tailgate decal.
Just my two cents,
Ray