I voted for Scorponok because he's my all time favourite G1 Decepticon. And for me, it's about the character.
A ruthless yet honourable commander who was loyal to the Decepticon cause, Scorponok was the first Decepticon leader who genuinely considered forging an alliance between Autobots and Decepticons. And the decision to ally the Decepticons with the Autobots was a difficult and unpopular one. When Optimus Prime surrendered to him, Scorponok was tempted to use it as an opportunity to allow the Decepticons to decisively win the war. But after some 'aggressive negotiation' from the Autobots, Scorponok decided to go ahead with the alliance.
And at first one might think that it was an alliance of convenience, but Scorponok proved himself to be a true ally when an assassination attempt was made on Optimus Prime's life by Unicron worshipping acolytes on Cybertron - Scorponok could have easily walked away and left Prime to fend for himself, but he made the conscious decision to honour his allegiance and rescued Optimus Prime from the assassins. And the battle against Unicron proved to be Scorponok's finest hour, where he boldly attacked Unicron with his bare claws only to have Unicron reduce him to slag... and the scene where Optimus Prime is kneeling next to Scorponok, so that Scorponok would not die alone - and then to see him finally die in Prime's arms... to me that still remains the single most powerful emotional moment in all Transformers history and rivals the death of Optimus Prime in Transformers The Movie and Dinobot's death in "Code of Hero."
P.S.: I like STL's pic of Trypticon fighting the Dinobots. Slag seems to be trying to burn Trypticon's janglies off! You _go_ Slag!!![]()