Sunset, because it's a relaxing time before the night. I prefer night to day. I live in a quiet neighborhood (at least in winter) people go home and stop making noises when it's sunset, I also have a better view on the West and can see the sun disappear behind the mountains.
Sunrise gives me anxiety, most of the time it tells me the night is over before I couldn't even sleep. It's time for the garbage trucks, snow trucks, bus, cars, students, crows, dogs, everybody is waking up and making noise.
If we are only talking about the aesthetic, sunrise is not bad, I don't really see the "sun" rises because the forest hides it, but I see a deep orange glow like if the forest was on fire (suddenly gives me anxiety...) but I prefer sunsets, I get a better range of colors.