They are so different I don't think it is necessarily fair to compare them. But I think it says what type of Genre you might prefer.
I prefer love and romance mixed in with some action and not a lot of sadness.
So Twilight is my favorite
But if I liked action and death I would prefer HP. I just never felt like I got enough of the inner working of the relationships for my own personal taste with HP.
With all that said, I really love both series, I just prefer Twilight for my own personal preferences,
Yes, you're right. I guess what I meant was, it's not fair to compare the books you like to the books other people like. If someone asks for your opinion on a what you think a good book is, then they are asking knowing that it will be a book in your personal taste, and they take the risk of not liking it. But they aren't fighting you about it, and telling you your opinion is wrong. If that starts, that's where it gets pointless. :D