It depends on a few things:
1. You introduce them correctly (no pushing, no making the other jealous, etc.)
2. The temperament and past life experiences of each dog.
3. The age and gender of each dog. Same sex pairings are more likely to result in quarrelling than having one of each sex. Remember to spay and neuter to prevent unwanted pregnancies.
4. They are stopped from becoming over dominant over the other.
The German Shepherd would win almost every time it would very easily outmaneuver the English mastiff and get a bite on the back of its neck which it would hold until the English Mastiff was killed or until the fight was hopefully broken up.
In general I would say a mastiff.
i would recomend a rhodesian ridgeback, German shepherd, a doberman or mastiff.
The English Shepherd is a medium size dog ranging from 40 to 60 pounds for females and about 40 to 70 pounds for males. I believe the German Shepherd is also classified a medium size dog so you would have to take an educated guess from here.
Mastiffs are much heavier, larger and more powerful than a doberman is. Mastiffs were originally bred to be fighting dogs, though in today's world, the domestic Mastiff is more gentle and laid back. The same with the doberman. Dobermans, because they are smaller and lighter than a mastiff, are quicker on their feet, and probably can do more damage than a mastiff is capable of doing. But the jaws of a mastiff are very powerful, and once in those huge jaws a doberman wouldn't have a chance.
only if the german shepherd as a pug them yes but no
German shepherd would be a better pet
no they live with there owners so why would they
A German Shepherd is a naturally a guarding dog with excellent skills. They will restrain your intruder and won't actually maul the intruder and normally not inflict deadly harm to an intruder. Whereas a Bull Mastiff would probably actually aim to kill someone if provoked. You obviously don't want a lawsuit on your case.
a bull mastiff would win in a fight especially if you take good care of it and give it the right food it needs to grow and let it have enough space to run but if the dog was sick and weak a German Shepeard would win in a fight
German Shepherd
German shepherd.