Upload & Sell: Off
"Portraits" is a way-big field. I use a beauty light primarily for fashion/beauty-style headshots. Whether I use any grid or not depends on how tightly I need to control the lights area of coverage. I'm usually on location, so that's where it makes a difference: How tightly do I need to control the spread of light?
If I had a run of jobs where the answer was coincidently "really tight" for every location, then I'd wind up using a tight grid a lot that month. The next month, maybe not.