Too bad the Atroce Blade is really only good if your running two types of builds. Either extremely DEX heavy, or extremely CRIT heavy. Otherwise don't plan on hitting much. Atleast with a +10 DTP / DSP Bastard Sword you would hit alot of your targets w/o having to invest in some majorly expensive CRIT gear, or having to sacrifice alot of points into DEX.
Their both Neutral to begin with, so unless you have a Nibel too.. most likely your endowing alot for whatever use you have in mind for it anyway.
lk sword answer... get a nib.
His answer is basically the answer of all answers. Two-Hand LK's fail in comparison to the Nibel. Maybe save your money and go straight for the "Holy Grail" of Knight weaponry.