I like dominant dogs. Dominance is not necessarily a bad trait. It is a trait that can cause trouble if it is allowed to get out of control. Dominance is not aggression. Dominance is a desire to run things.
Aggression is the desire or intent to cause harm.
The aggressive dog intends to hurt or damage another living being. Sometimes a dog may exhibit both dominance and aggression. Some may only show one of these attitudes. With any dog that has shown aggression be careful. If you are unsure of yourself, or the dog, please get help from someone with experience.