I would suggest you try the demos :). Terregen you know is free, on a side note with the free version you limited to render size. I've tinkered with Bryce and am waiting for the update. As of this time the render engine so slow beyond the pale, you get good renders but you wait days sometimes for a pic to finish, but the render quality is good if have that kind of patience, which I don't ROFL!!! However with the upcoming update the render is supposed to be sped up & you will also be able to import PZ3's in the new verison. I find Bryces interface a bit confusing, but there again it goes to preference. I'm a dolt when it comes to learning things, & I found Vues manuel to be SUPERB & interface very easy to get a handle on. I still have tons to learn with Vue...there are so many embedded items within each editor, I've barely touched the surface, but that's my fault for just simply not having enough time.