Aristotle was interesting.
He made several discoveries that weren't verified for hundreds of years, but turned out correct.
He also made our biological classification system.
Socrates and Plato are pains.
Plato I'll focus on Platonism.
Socrates, I'll examine his Crito (I had to study that a couple years ago and write a paper on it).
Thank you, everybody. I no longer have 0-voted answers.