Here are just some raw numbers from various 3 strike swords, for those who don't know already; if you use a charge attack with any 3 strike sword then you can immediately go into the 2nd and 3rd parts of the regular combo.
Calculations
Charge damage + 2nd hit + 3rd hit = total
(for brandishes an explosion hit is counted but since the enemies are immune to knockback only one is counted)
(status damage is not counted)
All damage taken from WIKI pages
All from stratum 6
Glacius plus combo end and the one explosion it gets on stationary targets: 1471
Leviathan/Celestial plus combo end: 1565
CIV plus combo end: 1783
FOV plus combo end (dear god): 2871
(note: None of these factor in damage bonuses)
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Conclusion: FOV, CIV, and Leviathan all outdo brandishes when dealing with Deadnaughts and Howlitzers.
What about WRH? Like with DPS in non-stop attacking.