Head monks or nuns

As a Vijnaptivadin (a Buddhist whose views do not entirely conform to any one school), I attend both Theravada and Mahayana* temples.  It seems to be almost universally true that the Mahayana abbots/abbesses make a bigger deal of themselves than their Theravadin counterparts.    Which is ironic, given that they also make "ego" into a thing which needs to be eradicated, or at least seen through.  (The Buddha only spoke of ego, self, soul, atta as something which did not exist.)

*The Mahayana is composed primarily of the four schools of Chan/Zen, Vajrayana, Pure Land and Nichiren.  The Vajrayanists like to think of themselves as above the Mahayana, but they are actually a kind of Mahayanist, since they accept the Mahayana sutras and teachings.