I've come to settle this feud once and for all.
You cannot say the Sharingan is better than the Byakugan because they have entirely different purposes. What you can say is that the Sharingan is more powerful and more offensive by itself. The Byakugan is more of a tactical doujutsu, it's more defensive, more precision, it's more for search and capture missions, for spies, for reconnaissance, for sensors, for people who want complete control of the opponent's chakra flow. Besides, the Sharingan (as a thread posted earlier in the day) is a curse, for it to evolve you need to have people close to you die and undergo eye transfers. The Byakugan also has the best vision and insight of all doujutsu. Besides, it has been said that the Sharingan was somehow derived from the Hyūga clan's Byakugan. (Don't argue, look it up)
Saying the Sharingan is better than the Byakugan is like saying Swords are better than the Bow & Arrow..or than a Shield. They all have different purposes neither the Bow & Arrow or the Shield are useless.
So yeah, let the clash between fanboys and haters..begin..