scottee, I'm assuming 68% Deadly Strike (33 from Highlord's, 20 from Grief, 15 from Gore Riders). I'm assuming level 22 Whirlwind and Sword Mastery (no idea if this will be right or not, close enough I figure). I assume 31% Critical Strike (hopefully in the right ballpark). Level 90, 200 Strength/150 Dexterity as a base comparison point:
Shadow Edge (with 40% Ruby Jewel): 1770 - 4003 (avg 2886)
eth 1.13 Oath Balrog Blade (avg roll): 1451 - 7442 (avg 4446)
eth 1.13 Oath BB (perfect roll): 1700 - 8718 (avg 5209)
eth 1.07 Oath Balrog Blade (avg roll): 1451 - 8433 (avg 4942)
eth 1.07 Oath BB (perfect roll): 1700 - 9710 (avg 5705)
The extra AR boost is handled; I put you at 264 Strength for the Shadow Edge setup (319 extra AR means 319/5 = 64 less points spent in Dexterity -> 64 more points spent in Strength). Similarly, the Oath setups had 220 Strength (100 AR means 20 more points to spend in Strength). I don't know about the Enchant charges though, so I ignored that. Can't imagine it doing a whole lot of difference, then again I'm often wrong
Oh and btw, a Cryptic Sword does less damage. I recommend using a Balrog Blade, and trading for an 1.07 eth version probably isn't too expensive.
Finally, just for more comparison, here's the damage a Grief Phase Blade does under these same conditions (back to 200 Strength):
1.13 Grief PB (370 roll): 7912 - 8025 (avg 7968)
1.13 Grief PB (400 roll): 8481 - 8595 (avg 8538)
Hope these numbers help you decide.