I'm fairly new at it, but I like mornings way better because you get the first rush at daybreak, but depending onthe weather, you can shoot all day.
The night flight is great, but it's over in a half-hour or an hour if you're lucky, and in my case depending on where I go I have to drive back though a tunnel and a major bridge during rush hour to get back home.
A 40-minute drive to the hunting spot turns into a 2-hour drive back.