The fact that someone keeps thinking about who's better than whom as a character, is proof that no matter what do you do, there will always be people complaining. Sometimes, the amount of fans you have is directly proportional to the amount of haters. It's a pity that Sakura fans generally hate Hinata and viceversa, but it's kind of pointless to argue with these people. They care more about being right than about what actually happens with the story. Don't concern yourself with this kind. Thankfully, the Manga does not go one way or another because of them.
I'm saying this even though I dislike Sakura. I have my own reasons for doing that. I also love Hinata. But I'm perfectly capable of discussing one character without bashing another. Just like you ask why do people have to hate Sakura to love Hinata (or viceversa), I wonder why does the same thing have to happen with Naruto and Sasuke or Minato and Itachi.
I guess the hunger to nurture one's ego is strong.