I would think that too much droop would lead to a more sloppy suspension feel.
Also, I would also think how fast the suspension "droops" is more important than the maximum amount of droop when it is raised up.
I've seen different cars with coilovers get jacked up, and some would droop at a faster rate than others. From how I see it, it makes sense that the faster it droops, the more useful it is to keep the tire on the road as you pass by a bump for a split second.
This is how I see it, but feel free to englighten me; but I think there are a lot of factors being left out here in the discussion