Haste Samba with capped gear haste and haste spell will increase your marginal attack speed by 9.09%. However, you lose the Double Attack trait from WAR subjob (dropping you from 23% DA 18% TA with the 'ideal' set up to 13% DA 18% TA.) The 10% Double Attack trait would bump you up by a marginal 5.59% attacks per round (8.18% without Apoc.) This assumes Triple Attack procs overwrite Double Attack procs.

So, they're close even if you completely disregard effects of sinking TP into Haste Samba, the one second stasis from using Haste Samba, Double Attack procs on WS and Berserk. Should be pretty clear that, in terms of pure damage, /WAR > /DNC.