Eco solvent usually is for Epson DX4 print heads, most of eco printers like Roland, Mimaki, Motuh,that others. Eco-solvent as some guys said less smell. So it is environmental friendly ink. This is the first reason why it is better than solvent ink. Secondly, Epson DX 4 can print high resolution up to 1440dpix1440dpi due to its dot is very small.