If I had to choose between those two, I'd go with Barrage and Wailing Weapon. Wailing Weapon interrupts all attacks while choking gas interrupts those casting spells. If you have 16 in expertise, both will end up costing 5 Eng (since WW is a spell and is unaffected by Expertise). Both choices will in terms affect that target and those adjacent, so I think it just comes down to whether you want to for just spells or all attacks. Warmonger's Weapon is a pretty handy skill to have too.
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