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Pole Vaulting is useful too. But low health and only vault over 1 plant. Conehead has higher health and you can send 2-3 Coneheads together, it is very effective to kill Snow Pea and Magnet-shroom.
I think Conehead is more useful, because he can eat plants and protect himself from other plants in other lanes at the same time, while Pole Vaulting can only jump over one plant but has the health lower than Conehead.