i think its they are all mentiond at least ones a episode on sienfield.
THEY ARE ALL FAMOUS AND I LOVE THEM ALL!
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The similarities is that the Yankees and Mets are both New York teams and both of their stadiums were recently torn down.
The real difference, other than different players on each team, is they are two teams that are located in different cities and play in different home stadiums.
There is enough population and revenue to support two teams in the area. California has 4 teams currently ( LA Dodgers, LA Angels, Oakland A's. San Francisco Giants).