I'm not sure about Maya, but fbx review gives me tris no matter what. It seems to me it triangulates the model no matter how it's exported. It also triangulates the quad obj's which look good on sketchfab. So fbx review appears unsuitable to review triangulation.
Anyway, I've tested a bit and noticed something. All tests have been done with 3dsMax 2016 and fbx 2016. I'm testing the "triangulate" option in the fbx export options, nothing else. I've tested by uploading the model to sketchfab and turning on the wireframe. Using fbx review was of no use me, since it shows triangles at all times. The testmodel was a single editable poly with one quad (4 vertices)
- Turning the "triangulate" option on produces models with triangles. That makes sense.
- Turning "triangulate" off also produces a model with triangles, which is unexpected.
- Turning "triangulate" off AND setting the fbx output to ASCII gives me quads!
When I compare two ascii exports with triangulate on and off in notepad I can clearly see the extra edge in the "triangulate=on" model. I'm unable to compare the binary files but their bytecount is exactly the same while the ascii versions are not.
But then I quickly tested two binary fbx exports with triangulate=off with the fbx 2014/2015 and fbx 2013 versions. Both versions show quads in sketchfab.
Conclusion: the fbx 2016 exporter appears to ignore the triangulate settings OR there's a difference how you import fbx between 2016 and other versions.
Here are the exports in all the different versions I've used: fbx test exports.zip (19.8 KB)