They both originated from kaguyas Byakugan. Hence the hyuugas always being acknowledged as one of the four ancient clans.It is still not an evolution of it. The sharingan and rinnegan share a common orign, they both came from kaguya's rinnesharingan.
Hogoromo got the rinnegan and later his son got the sharingan, kishi made this more obvious by naming kaguya's dojutsu rinnesharingan.
However, that does not make the byakugan more powerful. At all. Feats prove sucess.