Graphics: Battlefield 3: With a new, super-powerful engine (Frostbite 2), BF3 is capable of rendering top-level graphics with the best lighting I have ever seen in any video game. It's absolutely beautiful. Modern Warfare 3: Looks about the same as Modern Warfare 2, with some improvements.
Grittier than Battlefield, but good nonetheless. Winner: Battlefield 3. Modern Warfare has good graphics, but BF3 is GORGEOUS.
Multiplayer: Battlefield 3: Wide-open, tactical gameplay. Heavy focus on teamwork and less emphasis on killing enemies as completing objectives. Also includes vehicles and destruction.
Modern Warfare 3: Close-knit, hectic, classic shooter gameplay. Getting kills has never been so fun. Has proved immensely popular (look at all the sales counts!).
Endless fun. This one is a tie. It comes down too much to personal preference... But I personally prefer Battlefield's multiplayer.
MW3 is too fast-paced for me. :P Campaign: Battlefield 3: Uninspired, takes itself too seriously. Not too profound, though does include realistic elements and some cool moments.
MW3: Bad beginning, but is explosive as always and delivers a decent ending to the Modern Warfare series. Delivers well. Winner: Modern Warfare.
I actually cared about the story in MW3, while BF3's campaign was almost nothing more than a trophy-grinding chore. Audio.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.