Well I have to say I like them all, but Oscar goes to New moon.
I started reading Twilight and it really impressed me. I found Bella so much like me, in a hundred ways. Then I red New moon...
In that time I was going trough very hard emotional crisis... My own Edward realised that I'm not good enough for him, and it's better for us to stay friends... Edwards' speech in woods, and Bellas' disorientation in time and space, her catatonic state and quote "Between pain and nothing, I'd chosen nothing." was exactly what I did then. Reading something that is happening to you is pretty scary but fascinating.
Like everything in that book, before trip to Italy was like my life. I just couldn't stop crying reading it.
Now, maybe would say, if it's so much hurting for you to read it because it reminds you of something bad, how can you say it is your favorite book? Well, answer is simple. My own Edward (I call him like that, because I made up Edward similar to him) never come back to me. It is like he never existed, really. He went back to his hometown and I haven't seen him since our last "talk". So, even if I'm pretty big girl, and miracles are not something what happens to me, I still hope, somewhere deep inside, that maybe... One day he will come back to my town, to me. I'm not brave as much as Bella is to go for him, but I also know that whatever I do, he surely won't try to kill himself
. So my chance to be lady hero are zero
. But, when I can't have happy end, and have my Edward back, I'm so happy cause Bella can. And that's the biggest reason New moon is my favorite book.