The skin shaders are so dependent on lighting that if you have a heavy AO scene, then they actually do nothing. I like the AO and ambient lighting ability of Vue and this is basically why I use it for scenes.
So, it's all a trade-off. Poser works so well with skin shaders but its renders are not so good. Vue renders beautifully but the skin shaders are lost in many cases because of the lighting set-up.
That's life.