Yes I would pick a week in July over a grad night week any time. I have done both over the years and just find that the grad night crowds are too unpredictable. Sometimes it is fine but other times the hoards of teens are obnoxious. In terms of crowd levels, there have been many threads lately on this and other sites decrying the shrinking off season. It is crowded all the time now. It is just a different crowd depending on whether your trip falls at a time when the lower levels of APs are blocked out. When APs blocked then you get out of town tourists and that is what you will get in July. I actually like the July crowd mix as well as the super long summer hours. If you get there at park opening you can have lower crowds and cooler temps in the morning, take a looong break at your hotel at the height of the midday heat, and then come back at 6pm and still have a good chunk of time until midnight for fun in the parks.