You know why this happens?
Main clan of storyline NO JUTSU.
And the uchiha clan are infinatley more powerful.
Byakugan: Near 360 vision, allows user to see chakra of others including chakra points.
They form the hyuga style as a form of sparring based on their kekka gengai
Evolution : None.
Sharingan : Allows the user to copy nin jutsu learned from others. Gives the user enhanced line of sight, widening their feild of vision, allowing them to see past blindspots. Allows the use of basic sharingan gen jutsu.
Allows the user to see attacks before they happen.
Evolution .
Ms : Strong gen jutsu. Mangyekyo sharingan. Atmartsu enabled, susanoo enabled.Kamui enabled. Slow deterioation of eye sight after activation of this god like/ formidable jutsus
EMS : Strong gen jutsu. Mangyekyo sharingan, atmeratsu, susanoo and perhaps other unknown abilitity. Allows spamming rights
Rinnegan : God like abilites.
-bring back the dead
- Shinra tensei, universal pull
-chikabu tensei
- can have linked vision thus allowing 360 degree vision
- allows many powerful summonings
-allows the body to be transformed into a super powerful robot filled with weapons
-allows absorbing of nin jutsu. Sucks chakra out of attack rendering it weak and powerless.
Can be switched between EMS and Rinnegan at will to the convenience of user.
So many powerful abilites that can be evolved from the sharingan, while the byakugan only grants 360 degree vision with the ability to see chakra.
So which is better? The answer is obvious .
So mainly its because of
---a overall better keka gengai----
---plot no jutsu-------