I'm good with a mix of both.
Evening games can be fun, primetime makes the stakes feel bigger and it's a great way to cap the night when it's a win. A great example was that 2012 night game Vs. Syracuse. Plus there's that anticipation factor that builds throughout the day until kickoff that makes it more hype.
With that said, 11 a.m. and 2:30 p.m. have their positives, too. College football really does look stellar on a crisp Saturday afternoon. I usually stock up on food and drinks the day before so i'm set and it's nice rolling right from GameDay into a Gophers game. Plus, after the game there's plenty more football to enjoy the rest of the day.