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Pain. Mercs isn't a good primary choice, though.
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Don't take the Mercs/ hate to seriously, my Mercs/Traps PvPs beautifully. Just make sure you get your Achilles's Heels.
Truthfully, I would go Mercs/Pain, its + and -Res stack well with Mercs, plus you can give more than 1 pet a "Tier 9." Serum to the Medic and Painbringer to the Commando.
Oh yea, Mercs/ gets Confuse resist and protection, Robots/ do not.