Regarding those two weapons, Sarnak by a long shot will give better aggro. The other is just a raw Damage proc.
Silken whip has a better ratio than both. Stun aggro is a bit more than snare. Snare is a LOT better than the venomous axe proc for aggro. Silken whip is also dirt cheap so a good option if you're on a tight budget.
Frostbringer has a solid ratio. The AC debuff proc on live was comparable aggro to snare (less than stun). I would wager it is similar here. Great weapon for sure. The ratio puts is on par with Sarnak hammer on average with more reliable swing hate when prices are stingy.
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