I'm not sure how WorldBuilder works with Poser either as I don't have it. I DO know that it has a steep learning curve. Bryce 5 has a funky interface (some like it tho) and Vue d'Esprit can import .pz3 (Poser's native files), but it's buggy. I use Vue d'Esprit myself, and since I can't speak for WorldBuilder, and I find it the easiest between Vue and Bryce to use and understand. I renders just a little bit faster than Bryce too. However, you must weight what you are willing to deal with: hard to learn (WorldBuilder), hard to get used to (Bryce) - because of the interface, or hard to tolerate (Vue) - because it's pretty buggy right now. Laurie