difference between sau and ori?
There is no difference in meaning or grammar. "Sau" is much more commonly used, "ori" is slightly formal.
Wouldn't it be more correct grammatically to translate this as "He or she?"
Technically perhaps, but English speakers are generally reluctant to use "he" and "she" when not functioning as a subject followed by a verb.
Why not he or she?
Is "ori" exclusive or?
he or she - is also correct answer.