I believe the murder of Banquo is "worse".
Duncan is killed alone in his chambers while Banquo is murdered in front of his son Fleance.
Duncan is advanced in age while Banquo was in his military prime.
MacBeth is haunted only by Banquo's spirit, leading me to believe that the supernatural powers found this death more offensive.
That depends...murdering Duncan is serious bad karma because it disrupts the great chain of being, thus throws the entire natural order out and risks chaos. So from an Elizabethan audience's perspective, the most shocking murder might have been that of the king. It is, after all, high...
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