Well since Crusader Strike is being changed to no longer benefit from Spell Damage, I'd go with the Axe. Plus, The Oathkeeper has never struck me as a particularly 'impressive' weapon, it looks like a giant block of candy. The Axe looks cool, hits harder right now and will hit even harder next update.
There's also the simple fact, if you've got your heart set on a spelldmg two-hander you can get War-Torn Battleaxe from an SMV group quest instead, which is free and nearly as good.
~sins