I have also been doing research and as for the Epson platform the 4880 engine seems to have a better print quality than 1800/1900 engine.
The 1800/1900 engine does seem to be a bit faster, I'm concerned on the durability of the 1800/1900 printer compared to the 4880.
Your correct, the 1800/1900 based print engines are faster then any of the 48xx based machines as those print engines where designed to be used for proofing and small giclee prints.
As far as durability goes there's a bit more involved here then meets the eye.
The capping stations reliability, longevity and mechanisms are virtually the same in nature.
Actually the capping station design of the 1800/1900 models are better suited to handle white ink since the capping station cap is spit in half keeping the white ink and color inks separate, this allows one to clean and pull white ink through the system without wasting color inks if provisions are in place to facilitate that function.
The only other difference is the X axis rail that some manufactures add roller bearings replacing the polymer ones.
The other mechanisms that factor into longevity and durablity has to do with the transport system that include the mechanisms that move the platen or printer depending on the design and has nothing to do with the print engine used.
In addition to the required mechanical systems the ink delivery system also plays part in the durability longevity and functionality of the printer when white ink is incorporated. The stock ink delivery systems do require some changes to handle the addition of white ink.
Its should be asked what steps have been done to address all these concerns when looking at any DTG printer regardless of the print engine.
My usual reply when asked what the difference is between these 2 print engines really comes down to productions requirements or print width as all these print engines have the potential to produce quite extraordinary results.
