I never gave it much thought as we usually try to get everything done around 3 p.m., but I saw Martha likes to do 2 and most others like noon.
Curious at what time you prefer.
Food cooks more evenly, no hot spots or needing to flip or rotate (by hand).
I couldn't tell you if there's a difference between the two, but it's an excuse to buy another tool in the arsenal and most like the cool factor.