It is really up to experimentation with the unknown solution and raw materials the factory uses. As far as I understand it pigment inks are a bit more difficult to manufacture because of the pigments themselves.
The big firms ground their own, and obviously know the ideal mixture for a certain printhead with a consistent production line. While generic factories buy the pigments externally and just mix to make a general 'one size fits all' solution. That adds another layer of variables/inconsistencies.
There can be inconsistencies with generic dye ink as well.
Currently I'm using cheap generic dye ink in a pigment printer (Stylus Photo 2100), that I found to have more water content than a quality ink would have.
On single sided cast coated papers, with already lowered ink limits (around 30%), the paper starts waving due to the excessive liquid no matter the quality of paper. Double sided coated or resin coated holds its tension due to the double/extra layers.
Additionally due to the lower viscosity (in general to pigment ink) the waste ink area is a bit messier and when doing some service the head leaks ink.
No issues with printing aside from the before mentioned and I'm not happy with the tone of the black compared to the Epson pigment black I use in the R2400, the colors reproduce great before and even better after profiling.