Depends on what version of Poser and Vue you have. Ever since Vue 4, Vue has been able to accept Poser scenes directly. Now, I haven't used Vue since version 4, but I haven't heard that's changed.

If you want to use .obj, you have to collect the scene for output in Poser and save all to a folder which is a PITA if you wanna change something later on. You'll have to export everything again. For Vue and .obj, all the texture maps have to be in the same folder as the object, or you'll manually be applying texture maps to every .obj in Vue. Once you get a few objects in a scene, that can quickly become a jumbled mess.

Laurie