I agree. I always adopt grown dogs (used) because you can tell their personality. You get a puppy at a pet store - you have no idea what their personality is.
I like mellow, non-destructive and obedient dogs. I don’t like hyper, destructive animals whose only goal is to get out of the fence and run off. Who knows what kind of personality that cute little puppy will end up with?
Besides, so many animals are killed every year - these used animals need homes.