I started with Bryce 5 and moved just recently to Vue 4. I think Bryce has a better rendering engine (but very time consuming), but Vue tends to look more realistic. People can always tell when images are rendered in Bryce for some reason... My only other reason to choose Vue is for its materials/texture setup. It's pretty realistic if you work at it and very easy to use. Bryce's Deep Texture Editor is hell...even incredibly experienced 3D artists have been reduced to tears trying to figure it out... There's my two cents...