And yet at the same time, Byakugan allows you to completely cut off a shinobi's chakra flow, allowing you to stop a fight before it's over. x) Can't really fight back if you can't use jutsu regardless of your sharingan. I'd say, if we aren't counting the Mangekyou sharingan into a fight, byakugan wins easily. Once mangekyou manifests it's more likely to turn into the favor of the Uchiha/Sharingan user.