One on one as you're saying, the Orc wins every time. It'll take much more than 1 NS run and 1 spell run to destroy an attacker. The smart Orc runs high WTs and takes significantly reduced damage from the NS and doesn't really care if the Farey destroys his economy.
Each hit on a Faery is taking 15% of their land before taking into account gains science. Each hit on the Faery can reduce their defense by 6.6% or so. (Bloodlust+BG) The Faery won't be able to kill the Orc's elites fast enough to survive.