I have a question regarding using using VRay's VRaySun and VRaySky system versus using an HDRI in the environment and reflection (and refraction if need be) slots. Several people have told me that I would get more consistant results and better control using the VRaySun/Sky option than if i choose my own HDRI. In essence, they are saying that using HDRI is obsolete, as the procedural VRay system can do all that HDRI does and more.
I have found the opposite, however- after I set up the VRaySun/Sky system, I like to choose my own spherical HDRI from a collection. I find that the images are more subtle and vibrant. It takes a lot more tweaking and trial and error, but I find that a good HDRI can really make an exterior scene "pop".
Does anyone have any thoughts on this? Perhaps I am just of an "old school" VRay sentiment- in this case, Old School being because I learned from the Gnomen lighting tutorials (pre-VRay Sun/Sky) and it's always worked well for me.