My last version of Bryce is 4, so I couldn't say much about Bryce 5, but I can say that Vue 4 is worlds easier to use and faster to render than Bryce 4. Just my opinion, but Vue's World Browser feature is worth it alone, and the four viewports and the highly intuitive material editor makes object placement and texturing very easy. Best thing though is to do as suggested and try the demo. I fell in love with Vue the very first few minutes of using it, way back when version 3 came out. :)