Vue or TG... That's an old debate.
My opinion is that it all depends on what you want to do. If your focus is realistic rocky/water landscapes, TG is the way to go. If your focus is everything else, Vue is the way to go. Vue has a better integration with Poser, has ecosystems, has an incredibly powerful material editor, has wind on plants, has a plant editor, has a great lighting system, etc, etc. With Vue, you can make interior scenes as well as exterior scenes.

For the images that I want to create, I could never use TG. I also tried it when I started playing with CG, but quickly realized that I would be extremely limited in my choices. But that was for my images. It all depends on what you want to create, IMHO.
Vue isnt as perfect as TG in realism of rocky/water landscapes but, IMHO, that's a low price to pay for the vast possibilities that it offers.