For Posing - well, Poser 4 does that faster than Poser 5 so you'd be better off sticking to Poser 4 if it meets your general requirements elsewhere. Poser 5 only really come sinto its own doing things that Poser 4 can't do - things that often were left to post-processing for Poser 4. I love Poser 5, but I could never suggest it was as fast as Poser 4 for general work.