Allthough being a old-time and obsessed poseruser I also use D|S, but I spent more money on plug-ins to get the same functionality then what you pay for a new version of poserpro 2010.
So to call D|S free software is far beyond the truth.
Of course D|S has features that are superior to Poser: I wish there was something like animate+ for poser, D|S is beter organised and you can setup the whole interface just the way you like it.
But I wouldn't drop poser for it:
Dynamic clothing is supported on D|S, but only if you buy it, I like to make it myself and although such a feature is promised for more then a year ago, it's still not there.
Poser's materialroom is easier to use than D|S shader-builder/ shader-mixer, perhaps they have more functionality, but it lacks a proper documentation.
Documentation is also a poor aspect of D|S, of course there are the WIKI pages, but a lot of documentation is work in progress, IAO: it's not there.
One good exception are the figure setup tools, which are also superior to poser, but again, there's a nice price-tag on it.
D|S should support HDR-images, but AFAIK there is only a converter for HDRI to TIFF-files to use with the ubershader plugin, I consider that as fraud: TIFF isn't HDR IMHO.
Has anyone tried to make a real GI-render in D|S? It takes forever!

So I wouldn't say D|S is better than Poser, both have ther pros and cons, I think the most sensisitve way is to use both and take advantage of the strong points both programs has to offer, by example: I use D|S to setup animations, export them as PZ2 files and render them in
poser.

best regards,

Bopper.

-How can you improve things when you don't make mistakes?