Assuming they won't kill you first chance they get.
Elaborate your decision.
I choose Shockwave, he's the most logical wise Decepticon.
Optimus Prime counts as a Decepticon for killing Megatron when he wanted a truce.
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Edited by Shpip: 11/8/2014 7:23:29 PMShockwave, of course. His movie depiction was badass.