Size
The Bernese Mountain Dog is larger on average: about 41 kg (90 lb) as an adult, against 29 kg (65 lb) for the Golden Retriever.
Lifespan
In UK vet records the Golden Retriever lives longer: a median of 13.2 years, against 10.1 for the Bernese Mountain Dog.
Shedding
Their coats shed differently: the Bernese Mountain Dog sheds through the year, the Golden Retriever moults most as the seasons change.
Grooming
The Bernese Mountain Dog needs more grooming, daily brushing, where the Golden Retriever needs brushing a few times a week.
Exercise
Plan for plenty of exercise with the Golden Retriever, and a moderate amount with the Bernese Mountain Dog.
Temperament
They differ most on loyalty (Bernese Mountain Dog: bonded to its family; Golden Retriever: friendly with everyone) and on intelligence (Bernese Mountain Dog: learns readily, likes games; Golden Retriever: needs daily brain work).
Alike
Both are rated the same on affection: a lap or leaning dog.