Capella is a very big double star, each star being about 10 times the mass of our sun. But Aldeberan is a true "Red Giant" being more than 40 times the diameter of our sun. In this comparison, Aldeberan is much the larger of the two.
Betelgeuse is more luminous than Aldebaran.
The giant star
The distance between our solar system and Aldeberan is listed as 65.1 light-years.
Aldebaran is an actual star and has been used as a setting in numerous science fiction stories. see link
Red giant is a type of star.
A giant star is a giant dense ball of gas that is near its last stages of a star.
A red giant star.
A giant star is smaller than the sun.
A giant star can range from about 10 to 100 times that of our Sun.
Hypergiant.
one is big one is small