It honestly doesnt matter too much.
You see, if its been sitting overnight, everything drains all the way to the bottom, making it higher. If the engine is running, then it makes the reading lower.
What I do is after an oil change, run the car for 5 min, and check for leaks, then shut it off, take a break and come back after 5 min and check the oil. My cars dont use oil in between oil changes but I check from time to time n e way.