The strength of a Dōjutsu depends on the user always. However, by abilities the Sharingan is superior. With the Sharingan it's possible to see through any kind of jutsu, not just genjutsu. And the user can anticipate the movements+'In' of the opponent.
The genjutsu like Magen Kasegui no Jutsu or Iatsu Sharingan of the Sharingan are also overkill.
The old hag Lady Chiyo said, if you fight alone against the Sharingan, you should better run away....says it all.
Sharingan>Byakugan without a question. U-U
Byakugan:
-Follows high speed movement
According to the databook, that's wrong. Could you give me a source, please?