Thanks Brad , Shai.
I played a bit with Sun and Sky options in TCAD with the original model. While higher quality is a goal, I always must consider time, as billing hours become a factor. I do like the darker shadows that Sun provides and it is a fast , easy option to both setup and render.
It gets hard to compare programs because 'user error' is always a factor, but I've attached the Sun , Sky and a TurboFloorplan rendering. I think it becomes obvious why TFPlan is a good choice when doing the basic renderings to show the customer options. It does a good job and settings are very simple.
I alway post edit TFPlan renders in IrfanView with a slight Gama reduction, slight Contrast increase to darken shadowing.