Everyone's pigments/dyes are unique to that supplier. I have always found the majority of MF to be thin (watered down). The Lureworks line is great, I use them for the majority of my pigments/dyes. Their parent company (colortechnologies) supplies a good portion of the production industries so it is likely your favourite brands are buying the same pigments/dyes.
As noted above, every supplier's pigments are unique. As for Greenpumpkin, it never hurts to have a green GP like 109 as well as a browner version like 156 (both LureWorks colours)
I think you're referring to LureCraft, they sell a plastic labelled 502, not Lureworks.