There’s good and bad on both sides... but a well bred and well trained purebred Labrador Retriever will never be surpassed by a mutt when it comes to the desire to please their human family. There’s a reason why service dogs tend to be Labs/Goldens/etc.
I've had 2 purebread Goldens that were very easy to train to hunt upland birds and retrieve waterfowl. I have never seen a mutt that comes anywhere close to them, as hunters, or family/neighborhood pets.