Get reach the storyline is better the graphics are better the multiplayer is better. So in general its better and and at the answer somewhere above mine saying that bungie didn't try to make reach fun isnt true bungie made reach fun just look at all the custom games. It even has a map creation mode (forge) and the campaign has loads of easter eggs lie the grunts dancing to music or the tribute room and even the suicide marie so in general reach is better.
You should get Call of Duty Black ops if anything. Halo Reach sucks. Everything they made in that game is terrible.
Now on Black Ops. They actually tried to make their campaign and multiplayer fun and stuff. Get Black Ops.
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.