Differences

Call of Duty and Battlefield are both First person,military based game. But both are different in their own way. 

Call of Duty has smaller maps,more imaginative animations,not very team based,and doesn't own any vehicles. The time (pending on the game mode) varies from 3-5m,very competitive, and has a lot of little kids.


Battlefield on the other hand is known for its huge maps, realistic animations, team based, owns most modern day vehicle, but the time (pending on the game mode) last from 20m- 1hr, and is mainly full of adults