Comparison
Cane Corso vs Mastiff
Cane Corso
40-50 kg · 9-12 years lifespan
A serious guardian mastiff for experienced owners with space and structure - not a first dog, not an apartment dog.
Mastiff
54-91 kg · 6-10 years lifespan
A calm, enormous homebody guardian: modest exercise needs, immodest food bills, and one of the shortest lifespans in dogdom.
Side by side
Temperament
Cane Corso
Mastiff
Who should pick which
Pick the Cane Corso if you want an athletic guardian you actively train and manage: it has real drive, real suspicion of strangers, and needs an experienced owner with structure, space, and time - it is a working relationship, not a passive deterrent.
Pick the Mastiff if you want deterrence by sheer calm presence: far lower drive, gentler with the family, but giant-breed logistics - food bills, drool, a car it fits in - and one of the shortest lifespans of any breed, at 6-10 years.
Neither is a first dog, an apartment dog, or an impulse purchase. If a professional trainer is not in your plan, neither should be either.