Why would I use Poser?
I was under the impression that Daz was used for creating the characters, and that Poser was used for ... posing them I guess. But after installing Daz (yesterday!) I find that it has a built in posing system ... I forget the name of it, but I believe it's on a 30 day trial. Anyway, it seems to do a terrific job of changing the poses of a character. (animate2 maybe? -- I think that's what it's called).
Now I really don't understand what I would use Poser for. Does it do better poses than Daz? Does it make better looking models? Does it render better? Can you do things in Poser that you can't do to a model in Daz?