I'm RGUS, a 3D artist from New Zealand hence the Kiwi Avatar.
I've been using Poser since 2004 and recently begun to use DAZ Studio.
Originally I used the render engines bundled with the base software and it was not until Octane was available did I change engines. I believe iRAY, now supplied with DAZ Studio, does a very good job. However, my development has stayed with Octane since I use both Poser and Studio with Octane for each as the main render engine.