Powermaster Optimus Prime. He's more like a statue, but an imposing one. It would have been cool if he would look like the boxart, but the toy itself still rocks. I will probably never give him away.
Metroplex Fortress Maximus All of those little guys like Seaspray with the fused legs. but... ... ... Top of my list Powermaster Optimus Prime!
Powermaster Prime. Definitely Powermaster Prime. But there were a ton of "bricks" that I liked for one reason or another. Thunderclash had a really unique missile gimmick, G2 Megatron was loaded with special features, and then there's all the simple little G1 and G2 cars that were loaded with character, even though they were tiny and pretty basic. I guess articulation wasn't a big deal for me back then.