Definitely when it comes to big dogs I don't have a favourite "breed" cause whether I like a dog depends on their personality and behaviour.
I love the "breed" cattle dogs, but in reality I love a well bred, well trained cattle dog like my boss'.
I love Bull Arab/Bull arab mixes, in reality I love my clinic's Bull arab mix and the few other amazing Bull arab clients I've met.
The people I work with have a variety of big dog breeds that I see regularly, from cattle dogs to GSD, to Staghounds/wolfhound to Maremma, to Malinois. I like those individual dogs, not necessarily the breed.