I'm no expert by any means but have found setup to be the same, I guess it really depends on if your dog is ranging out or not, if it is coyotes will lock on the dog and not really looking for you but if the dog is sitting next to you well then they may see you as well, as far as the dog scent or presence of a dog some coyotes will bolt some will charge right in , I guess it depends on the coyote and what he is driven by? food, mating, territory? there are a bunch of guys that could answer this better than me.
but I do enjoy having the dog on stand and don't think it has hurt many stands