The frenzy skill was taken away from the wrist armor ALL group armor, but remains on the raid armor. Doesn't make sense that a defining skill of a class would be removed when upgrading from ToV to current xpac gear.
The BEST ToV group wrist gear for berserkers is Velium Infused Warmonger Wristguard. The upgrade for the same level of CoV group wrist gear is Velium Threaded Warmonger Wristguard. The immediate problem is, the newest version is missing FRENZY.