I'm Love TFP Megatron. He's cold, smart, ruthless and voiced by the original VA.
But Animated. Is also cold, ruthless and patience. It's hard to explain but Cory brings this like cold elegance to Megs. He kinda feels like a warlord and a mafia boss at the same time. Animated Megatron kinda feels like the Transformers version of Thrawn. Always, calm, and calculated, always there waiting for the right time to strike. And on top of that, how the Autobots react to him, it's true fear. With Prime is was more so hatred. But with animated..they leaked Energon. So that tells you this Megatron is no joke. Hence why up until the series finally. The only autobot he knew by name was Ultra Magnus, the only one who could beat him. Plus he didn't put up with any of Starscream BS.