In the canine world which dog does win fights heavy,bulky and strong ones or fast,agile,strong aggressive ones?

Like a huge wolf vs a fast and agile wolf or Like a Saint Bernard vs a Doberman Pincher, Rottweiler, German Shepard,and or Pit Bull.Would his heavy weight and thick fur and big head and mouth give him an advantage over those more aggressive and fast dogs.Saint Bernard are docile by nature and very gentle but can... show more Like a huge wolf vs a fast and agile wolf or Like a Saint Bernard vs a Doberman Pincher, Rottweiler, German Shepard,and or Pit Bull.Would his heavy weight and thick fur and big head and mouth give him an advantage over those more aggressive and fast dogs.Saint Bernard are docile by nature and very gentle but can they defend themselves against one aggressive faster dog bred if needed.Like if one of those dogs where off the leash and so was the Saint Bernards and one of those dogs where running o attack him I am talking about one on one not a pack ganging up on him just one aggressive dog.Are Saint Bernards wimpy and cowards or can they be aggressive?
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