Depends how each exporter handles different element. Also there will always be users who prefer the controls etc of one over the other. There are things that Poser does better than Daz Studio and (ready to wash my mouth out with soap) vice versa. As the programs develop and people create new add-ons there will still be differences. I mean not all artwork created in Poser looks the same, it depends on what the person uses and how they use it.

Why do the programs have to be the same for everyone to get on?

I once met someone who used Daz Studio who I got on with. Wonder whatever happened to whats-his-name? ;-)

Daz Studio 4.8 and 4.9beta, Blender 2.78, Sketchup, Poser Pro 2014 Game Dev SR5 on Windows 8 Pro x64. Poser Display Units are inches