Lifespan
In UK vet records the Giant Schnauzer lives longer: a median of 12.1 years, against 10.1 for the Bernese Mountain Dog.
Shedding
Their coats shed differently: the Bernese Mountain Dog sheds through the year, the Giant Schnauzer holds loose hair until it is brushed or clipped out.
Grooming
The Bernese Mountain Dog needs more grooming, daily brushing, where the Giant Schnauzer needs a brush once a week.
Temperament
They differ most on affection (Bernese Mountain Dog: a lap or leaning dog; Giant Schnauzer: likes its own space) and on independence (Bernese Mountain Dog: keen to work with you; Giant Schnauzer: cooperative, with its own ideas).
Alike
The Bernese Mountain Dog and the Giant Schnauzer are much the same size as adults, both about 41 kg (90 lb).