I just disagree. I don't like modern COD. I liked old COD but I wasn't very good at it. I have loved and been pretty good every battlefield game apart from the newest one.

There's a milsim community on battlefield. There isn't on COD because it's impossible to bring such an arcadey game to a realistic level by tweaking the settings. (Of course, battlefield milsim isn't actually realistic but it gets a lot closer... Otherwise no one would bother)

Battlefields flagship conquest mode rounds can last at least half an hour. COD's rounds last 1-7 minutes. COD's maps are for the most part classic 3 lane gameplay. Battlefield maps are much more open and the sky is literally the limit. The vehicles alone separate the franchises hard. Battlefield has recoil models, bullet velocity, and suppression mechanics, whereas COD is much more 'quake' style. Even in terms of classes, battlefield is oriented towards team fighting with resupplies, revives, and so on. COD is very solo-skill focused.

Their only real gameplay comparison are their campaign missions, which neither franchises really bother with anymore. If you look at recent game releases, people are hailing DELTA FORCE as the new Battlefield 'killer'. No one's comparing it to COD. They're just different. You could only not spot the differences if you'd only played TDM on Noshahr Canals.