As someone else said, if your shooting is going to be close, the dot is hard to beat. But if your shooting is out to 100 yds, and, I would add, if the light conditions are not good, then I would use a scope. Probably a 3 power. The more powerful scopes are for varmint hunting.
I have used the dot sight on handguns and on a shotgun for deer hunting and found it unsatisfactory because the dot tends to obscure the target when ambient light is low and that is when you are most likely to be shooting your deer.