In my opinion The Byakugam is too powerful. IT has the ability to destroy all ninjutsu and all chakra. Sage mode abilities around boosting attributes doesn't compare to shutting down a chakra path way system with a single strike.
With sage mode you are left vulnerable when gathering chakra which requires prep time.
But with the Byakugan you can activate it at any moment instantly and once active it doesn't need to be recharged.
Byakugan >>>>>>> Sage Mode
With sage mode you are left vulnerable when gathering chakra which requires prep time.
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Byakugan >>>>>>> Sage Mode