See potokopi folkvangr advice for severe rainstorm build reference, 70% def bypass to everything from MBTA with double emerald rings would yield better damage in most occassions than 100% def bypass to everything from pdm and single emerald rings.
PDM for complete defense bypass is pretty bad options if you wishes to boost SR damage, with its heavy LUK status investments (126 Base LUK). Because as you all might have known 2 statuses that directly affect SR skill damage modifier are AGI and DEX, so by using PDM to achieve 100% def you're likely compromising these two important statuses.
The other options aside from MBTA to afford huge def pierce without compromising status investments are Abusive Robes (Demi-human, Demon, Undead races only), SS card (complete def bypass everything except Boss Protocol), +10 Devil's Hand (complete def bypass everything) or MoT (complete def bypass everything and occult impaction effect).
If the monsters you're facing don't have significant defense to begin with, armor with massive damage modifier such as Abyss Dress against demon, shadow, undead, undead will yield better damage than any alternative armors with def bypass features.