It appears to my untrained eye that the Blender Conversion is slightly better than the FBX autoconverter. I do mean slightly. There is a saying the USA, "It's six of this or half a dozen of the other". It's that close. Also the textures once the item has been converted were exactly the same.

I confess that I'm not a Blender Guru but I'm learning as I go along and somethings are coming back to me. Before rendering, the ship near the blonde is the Blender Conversion. The ship near the redhead is with Autodesk's own converter. As you can see, Blender seems to line things up a bit better, however....

After Conversion Both ships look pretty identical. I have to put in a few hours (Friday night is always our busiest but I'll test for triangles and quads. I DO want wish to make groups if just for UV purposes. There isn't really any moving parts. Any gun turrets will have to be added afterwards. I'd like those at the very least. But you know. One of my deal stoppers are shuttles or ships that don't have at least ONE logical working door. Plus I want to try that change to quads function on a small fighter OBJ. That canopy doesn't work in poser.. Not a surprise, I knew that when I purchased the model. Still it would nice if I ever wanted to try animation. Below is a render after conversion. You can see how close they look. Six of one... half a dozen of the other.