#3 Wrestlemania is worldwide
A worldwide phenomenon and a show catered for a global audience, Wrestlemania is the epitome of keeping the whole world entertained at one time. Wrestlemania as of now is ready to be aired in 175 countries, the SuperBowl was only available in 150.
You only have to look at the several commentator tables present at a WWE PPV to know the show is being broadcasted in several languages to cater to the interest.
In terms of physical global reach, the WWE tour all corners of the world, whereas the NFL only have limited dates in Wembley Stadium once a year. As a global company with a multicultural roster, they appeal to every continent on the planet. Vince has capitalised on his product's worldwide fame by ensuring all nationalities are represented on the card.
Whenever people think of Wrestlemania they think of a spectacle organised for the globe, the SuperBowl just screams an American theatre performance, exclusively for Americans.