I don't have C4D but I did try the demo and was quite impressed with it. However, I chose to go with Lightwave about 10 years ago because at the time there were a lot of LW tutorials and forum activity on the web.

Obviously Poser's render engine has made great improvements since the P4 days, especially with Mr. BB's help.

Attached is a Lightwave render with radiosity, LW with volumetric and then a Poser render. Not an exact comparison but the effort it takes to get a Poser scene into LW gives Poser the edge most of the time with me for connivence's sake. ^ ^