It completely on your status around PvE. If you're in an end-game guild and you're eventually gonna get the PvE offets I'd go for the shadowmourne + trinkets because Shadowmourne is a lot harder to get in PvE compared to PvE offsets. But if you know you're not gonna PvE a lot I'd probably go with PvE offsets and Oath binder as weapon. Because the stat upgrade from PvE offsets (bis 284/277) compared to budget PvE BoE offsets (264) and Wrathful offsets is a lot greater than just having 2 trinkets with shadowmourne. You'd basically deal a lot more damage with bis pve offsets, trinkets and Oathbinder than just having Shadowmourne and double trinkets.
Try to mimic this gear
http://armory.warmane.com/character/...ecrown/summary
(Without Shadowmourne)
Priority gear you should get is in this order Oathbinder > STS > DBW > Apocalypse's Advance (boots) > Penumbra Pendant (neck) > Signet of twillight (ring) > Coldwraith links (belt) > Toskk's Maximized Wristguards (wrist) > Vereesa's Dexterity (Back) > Fal'inrush, Defender of Quel'thalas (Throw, also assuming you could easily get a decent throw weapon that isn't WF i'd rank it here otherwise I might put it before the back) > Frostbrood Sapphire Ring (Ring instead of ashen, the difference is minimal - barely noticeable but if you're looking for the complete bis, it's a tiny bit better than ashen). Also, all the gear above is HC obviously.