When the sun drops behind our mountain we experience darkness or dusk faster than those living on the opposite side of the mountain. Alternatively those on the West side of the mountain have more darkness in the mornings than we do. I have found that getting the morning sun is good for gardens.
It is also good for getting your day started early and going to bed earlier. If they would just quit playing around with Daylight Savings time it would make life easier for me.
Depending on your life style, which side of the mountain you choose to live on is a personal preference. We just happen to live on the East side and that worked out well for us. I like to see the sun rise in the morning.