Which is better? COD, or Battlefield?

Such a big big big competition these days. From sports, typing, and video games. I love a good debate. So I am going to play either COD or battlefield. I can use them on the ps4.. Only because my brother is an xbox360 freak. So I want to know which ones better. I'm a quick learner with games. So someone has to convince me.
No:
- threats
- swearing

Make sure you:
- state your opinion to support your statement, or you'll look idiotic
- have statistics (that can help all the time)
- use caps lock when you can't take losing it

Good luck ;)