Hey @FourtyNights thanks for taking the time to answer my question. I think I need to elaborate a bit further exactly what I plan to do. What I currently am doing is researching into possibilities to write a ZBrush->Marmoset pipeline plugin for ZBrush. Unfortunately ZBrush only allows to export .OBJS (like you pointed out…
OBJ is a 'dumb' and simple file format, in comparison FBX can store so much more and you might encounter version-related issues when using that. Btw. ZBrush stores polypaint data in OBJ as well - but on the receiving end you'll need an importer that is aware of that non-standard part (Marmoset handles it, importer scripts…