I have Vue and World Builder. World Builder has a very hard learning curve. With Vue I was making renders in one day. Vue integrates beautifully with Poser, accepts almost everything Poser does except the Poser 5 materials, hair and cloth room functions. Vue has point lights, volmwtric atmospheres, easy to use interface and is very stable. (It hasn't crashed once since I got it) It renders faster than Poser, and can render animations over a network. I don't know Mojoworld.