Want your opinions on what you think the best bull mastiff x is and reasons why please?

i have a great dane english mastiff mix and he is the best dog ever. very calm and polite listens very well (take into consideration dog of this size when a puppy will be destructive and probably scale a 6 ft tall fence) but will become great. mines almost 2 and is better than any lab or retriever i know i've owned 3 labs. but my neighbor owns a great dane bull mastiff mix and he is 6 months older and for some reason is much much more uppity and not near as calm. it could all be in the difference in our training and raising, but either breed i would say put some dane in it. danes are such awesome gentle giants! amazing with kids and other dogs. i don't get as much drooling as a full mastiff. but i also didn't breed mine i found him in a shelter. very lucky find!!