Mulies tend to travel in loose herds, moving from one area to the next. If you spot a nice one, odds are you won't see him again next week. They do migrate from low lands in the summer to the higher elevations to escape the heat, and then return when winter gets too cold. This is a generalization and there are exceptions to the rule. Whitetails tend to stay in one area and can be seen year after year.
I have hunted both and prefer the Mulie. I suspect the reason is because I do love the high elevation and rugged terrain of the Rockies and Sierras compared to the area here in Alabama. To each his own.
No such thing as a stupid question. What is stupid is not asking it.