D|S can hold, render bigger scenes, than poser. The bad thing about D|S, is two thing. Doesn't have a walk cycle for characters and its own material room, although you can apply textures, and adjust em (reflect, transparent). I do have Poser 6, and D|S. I find after many years using Poser 4, 5, then 6, then moving into D|S to understand it, that D|S is more relaxing for a huge scene, lighting (3Dlights: Lights and Mood Master) is awesome. Poser 5, 6, 7, and now PPro has a straight forward material room (when you get to know it), and of course a walk cycle. Poser is hard on the system when rendering, depending what it is (poly counts).

Will be great to take advice from Gareee if you do get poser. Will save you a bundle of dollars. Doesn't hurt to have poser and also use D|S. Can have fun with both.