SU plugins Render Debate- Maxwell vs Vray vs Kerkythea

Maxwell 2.0 rendertime: 33hrs

Kerkythea 2008 rendertime: 13hrs (Path Tracing)

Vray 1.6 rendertime: 5hrs (IM 5 passes+LC 5000)

This debate is all based on the render plugins for sketchup, so Max and C4D are excluded in this competition. This is not an scientific way or comparing it, as its not rendered in the same duration of time. But I try to set them as relative as possible for high quality. The material settings is the difficult one, as all these renders use different parameters. But I want to compare here is not just the quality of the output but also the workflow, flexibility, compatibility and the time of setting up the scene. I'm all new to this three programs (architecturally), so the frustration also come into account. 

Best Quality: Maxwell > Kerkythea > Vray

Best Render Speed:  Vray > Kerkythea > Maxwell
SU Compatibility: Kerkythea > Vray > Maxwell
SU Flexibility: Kerkythea> Vray >Maxwell
Interface control: Vray > Kerkythea = Maxwell
Material Settings: Maxwell >Kerkythea> Vray
One click render : Maxwell > Kerkythea > Vray

Overall: Kerkythea > Maxwell > Vray