Megas

G1 Optimus Prime is still the best version of the character, and a lot of that is due to the fact that, while he was a wise and strong leader, he was still allowed to be goofy, crack jokes and one-liners and have fun, something most other versions of the character seriously lack. Animated is the only other version I can think of that was allowed any sort of levity, and that was because they made him young and more inexperienced in that one(before you say Primal, he's a completely different character)