Curate, connect, and discover
I like to think that during the time when Sonic hit puberty, he became a lot more confident with himself, and besides, he has his friends to support him all the way though it.
Metal Sonic is also going through puberty, but for robots. Eggman is absolutely terrified because he's afraid it's going to be another Sonic Heroes type situation. (cough cough Neo Metal)
Metal is 10 times more solitary and dangerous than before. His voice suffers from many glitchy voice cracks, and his hormonal instincts consume him like a runaway freight train. He can and will stab people, yet his hard drive runs on the equivalent of Windows XP, and he doesn't know how to emotion.