BF= win/loss is most important to the average playerCod=kill/death is most important to the average playerThat "motivation" makes a huge difference in game play, the map sizes of BF make camping not as rewarding because less people run through your area. Camping is nearly impossible because when people know the corner your hiding in you got C4 all over the back of the wall. BF generally has more teamwork in all game modes, and is generally more strategic(this is from the BF motivation of win/loss because you cant win on your own). This is all because of bigger maps, certain roles for each class, and a variety of ways to approach the objective; like having a friendly sniper cover you from across the map by spotting and killing, stealth-fully jumping out of a helicopter, going straight for it in a tank, have your squad push up, and many more.Cod gameplay is more like a FFA, just some people cannot hit you (your team mates) this is usually because you only need you to improve YOUR Kill/Death. Smaller maps create efficient camping, killstreaks rewards campers, and since the objective is one of the most heavily guarded areas on the map generally people who want a kill streak don't go for it. Btw did i mention how COD made it easy to camp, motion sensors, enclosed one or two entrance buildings and becuase guns kill so fast they can kill you before you see it coming. And cods fast gameplay create a connection whore fest.