1. Differences as follows --Creation of Homunculous is entirely different in Brotherhood from 2003...so do there way of killing..in 2003 it was more like a exorcism than alchemy to kill a honuculous( I mean seriously part of there original body)...in FMAB they were created by one man(if we can call him that and I don't want to spoil anything so lets just call it a human) where as in 2003 they were the side product of human transformation alchemy. --Al and Ed's mother never came back to life not as an homunculus..in 2003 she played the role of Wrath where as in original story Wrath is a huge monster who lacks any kind of intelligence.
--Dante is the villain of 2003 only and her reasons for stone was ridiculous where as in Brotherhood Father(not Ed and Al's father but yes he was somehow related with this father) is the original anatgonist and his reasons are even bigger than Dante's little hope of survival.. I mean after all he is the creator of all homunculous himself. --Many more characters than 2003 version... -- Greed has played a major role in FMAB where as Lust got a really small role in this series(in 2003 she was like a main character and played major role in that anime)..plus Ed never killed Greed...you will see him in a new character in FMAB. 2.
Brotherhood is not a sequel but is the remake of this awesome manga...2003 version was more like a filler and got really awkward from the point it drifted from the manga so all the things happened after episode 30 has nothing to do with the original story from manga. 3. Conqueror of Shamaballa is related with 2003 version only and has nothing to do with Brotherhood.
When you first begin watching both, the story plot is practically the same. As the story deepens that's where the plot changes. Fullmetal alchemist brotherhood is a remake of the original manga, staying strict to the manga storyline.
Brotherhood is a lot more cartoony, with a lot more anime typically drawings. The original is darker and has more detail in my opinion. After watching both series, you really realize that the original leaves out so many questions.
Brotherhood is way more conclusive and makes plenty of sense. Overall after about 15 episodes the plots completely split, there are similar parts, but the end is completely different. Think about is as twin brothers.
At the beginning it's immpossible to tell them apart, as they grow up they live different lives and end up in totally different locations.
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.