It makes about a 5% dps difference at 60. It makes zero difference on aggro as skill cap does not affect aggro at all.
I'm assuming one of your piecers is an infestation? If you're tanking and not in a raid guild, this and a frostbringer are going to be your best aggro combo.
Substitute Willsapper for the infestation in your primary for better aggro and more dps if that is your other piercer.
Frostbringer is more aggro and more dps than an infestation in the offhand.
On a side note, short of ToV/VP weapons and without the epic, the Frostreaver will be your best aggro. (If you're in either Riot or AG, the only two guilds on the server currently capable of killing dain)
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