#2 Availability
Due to the sheer size of the WWE, many Superstars on the pay-roll don't often come into contact with Vince McMahon. When they do, it's naturally quite a big deal as the only time they'll even so much as breeze past him, would be in the gorilla position just before going out in front of a live crowd.
On the other hand, Dana pretty much has every fighter in the UFC on his phone.
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Or so we're led to believe. White will happily fly out to have dinner with fighters in order to talk some business and generally have a good time, which is the sign of a solid boss. You could probably reach the president through a number of different avenues within the UFC, which automatically improves the working and personal relationships between himself and his employees.
Good old Dana loves a joke or two.