I think it depends on breed. We have a male golden retreiver and apparently they're known for being stubborn and staying "puppies" until theyre about 5!! Ours is 3yo and he's a total dumb@ss! We love him dearly, but he's an idiot. Whereas the female are supposed to be great.
We have a female collie and she is super sweet, affectionate, intelligent and gentle.
What breed were you wanting to get? Maybe you could find a fb page for the breed you want and ask others their experiences?