This topic has been debated already several times in this forum. I would say this is a matter of taste. There are several people who prefer the look & feel of characters rendered with the Poser shader tree. Other people prefer the look & feel of SkinVue. Others use neither, just a normal import. Each person will have a different opinion.

If you use the Poser shader tree, you'll get a render where the character will look very similar to what it would look like if it was rendered in Poser. But you must bear in mind that some more complex Poser shader nodes are not correctly translated to Vue, so you might not get exactly what you expect, in some cases. You also have no possibility to do fine material adjustment in Vue.

If you use SkinVue, you'll get a render where the character looks very different and very realistic and you'll have the possibility to do fine adjustments in Vue, until the character looks exactly like you want. Of course, you have to buy SkinVue.

If you use neither, you can still do material adjustments in Vue. You'll have a lot of things to change until the character looks realistic, but it's possible, of course.