Sentinel Prime is a far superior Antagonist toMegatron and Starscream.

Outside of the Bayverse and TF One he's so heavily underused and underrated because he never really takes the spotlight or isn't in very many scenes or panels. In IDW he was only somewhat prominent for the first part of Phase 2. There's so much you can do with his character in comparison to the other two that he's capable of being a much more multi-layered one and his designs are way more unique and badass looking