guess theres a lot of dif viewpoints on this one ........... whole family of dolls - grab make human

posing is no harder in blender then poser - in some ways a lot easier ~ is fairly easy to add a rig with rigify (or the other couple of rigs that are free) can use empty's to aid posing then there facial rigs helper bones drivers etc  can even use DS/poser dolls with a little work and collada export

as for render engines I can export or use half a dozen dif ones from blender for free (well not octane lol ), just tried Lux again the other day wow at least 10 times better then poser (getting BB to do my mats would help ) was even better then cycles but took over an hour :-( cycles did its job in 5 mins  

it all depends on what you want from this annoyingly fun hobby ~ most poser/DS users are more in line with fuzzy felt then most blender users