Would you rather have a calm, loving dog or a somewhat problematic but smarter dog?

I realized this morning that Frodo understands almost everything I say – that pertains to his interests. He certainly doesn’t yet do everything I want him to, although we are working on it. Gormless Prince was very calm and loving but not as bright. Realizing that in most cases, you get the dog you get, this is a theoretical, mainly for fun question. (And I also realize that there are many smart, but calm and loving dogs.)