Battlefield vs COD i have to say i got more memories of total chaos and awesome moments in Battlefield games that could never been duplicated in COD due to the amount of players, map size and vehicles, i loved the progression system too that rewarded you for playing tank, planes and unlocking more stuff.
This "levolution" at the scale of the entire map could be a game changer, the gameplay, sound, gaphics, vehicles, teamwork mechanics, objectives games are already there for a long time, adding this on top can really create the next step for the genre.
What i'm hoping for personally is better feedback when you hit another player, COD nailed this a long time ago, BF always had a certain lack of weight for the on foot gunfight.
EA or ACTIVSION both are awfull to gamers, COD did great in 2019 with Modern Warfare (reboot) with no loot boxes and battlepass, beautifull graphics and sound, but botched their game with bad map design to cater to new players with safe spaces and doors, cranking up SBMM ( matchmaking that pairs you with similarly skilled players but in a casual lobby, thus making every match a sweat fest) for retaining newer players and make them spend more $ in the shop, this has been worse with 2020 Black Ops Cold War...
So EA have a real golden opportunity here, the last MODERN BF was a while ago and somehow managed to piss off everyone and screwed everything, COD came back in full force but now is trying it's best to piss off everyone too, EA could tone down the monetization and surf on SBMM controversy to get more players back give us 1 or 2 good years before ruining everything again once they get too cocky...
In fact i do believe this is a pivotal moment for each franchises as COD been focused on WARZONE and ACTIVISION recently announced they are going all in to push it even more in the future, possibly rendering classic multiplayer 6vs6 a thing of the past (for them).
EA had enough time to deliver a good BATTLEFIELD game and have 1 or 2 more years in front of them to expend on it before the sequel of MODERN WARFARE 2019 is released ( if WARZONE didn't kill annual COD ) the situation is favorable to EA.