Is traffic going 85 North worse at 7pm or 830pm? What time would you rather be heading home at, 7 or 830?

In the fall I'm gonna have to choose a class down a gsu that gets out at either 7 or 830 and I have no idea what traffic is like at that time, all the classes i'm taken thus far have gotten out at 9:45 so I have never experienced any traffic going north.