I know this is probably not the normal answer your gonna get, but I like the small one better. I have both on my front clip and the small one you can fit a screwdriver in it and it fits real tight and never slips out. The large one I have had a screwdriver slip out and scratch the schitte out of the paint. I do have one of the Dzus drivers, but it will slip out pretty easy too. If you're in a hurry you'll grab the first thing you can find in the tool box that will fit.
The one big advantage to the large one is the plate does cover more area and if it's a thin piece of fiberglass it may help keep it from cracking.