When working in ZBrush I like to work iterative when it comes to baking. Because of this I dislike decimating my mesh as well as long export times.
Therefore I did a little benchmark using the same mesh (4.3 million polys). It took ZBrush 50sec to export the mesh as .fbx, while only 15sec when exported as .obj.
Marmoset on the other hand needed 11sec to load the .fbx, while 6sec for the .obj.
On the flip side the .obj is twice the size in disk space.
I assume this speed/size difference has to do with some sort of compression.
So from a speed perspective .objs seem to be superior, the question remains though, is the quality on par as well? I read that .objs don’t store normal information, but this should not be an issue, if working with undecimated meshes anyway.