Well
Historically, FBW was developed for military a/c where instability was part of the control regime. A/C were too demanding of human control input, and many a/c could only be flown by computer. Military requirements are light years away from low and slow, there are dozens of missions, not just one. It will remain a discussion for years, I think. AB have proved the mission consistency of the concept, but no format is accident proof. When an argument is sliced as fine as FBW vs. (sic) Cable, it becomes merely preference, and that having developed through time. To a proud pilot, FBW seems arrogant, to another it seems preferable.
The bottom line? How proficient is the Captain and FO on either format?
AF