Zhu Yuanzhang all the way.
Cao Mengde VS Gaius Iulius Caesar.
I see Caesar as the better commander, general and warrior, becouse he led troops into battle, he was never defeated during Gallian wars, civil wars, leading his victorious troops in Italy, France, Germany, Spain, Greece, Egypt. He emerged victorious even against all odds (Alesia, Farsalo).
As a polititian he was a great innovator, but lacked the insight to not gain all the power on himself at once, leading to his own assassination. Being Rome a republic at that time, more caution was needed, and he trusted the wrong people (Brutus and Brutus Albinus among the others)
Although great, Mengde was defeated numerous times, so as a general i regard him as a top one, becouse of his insight, but not in the same league as Caesar.
Politically speaking though, Cao Cao bested Caesar in my opinion: he mantained his power, although nominally servant of the emperor, aquiring the wealth, fame and loyalty that allowed his son Pi to usurp the throne easily.
Two great men of antiquity, what is your view?
Napoleone Bonaparte VS Erwin Rommel
it's a close one, Napoleone was the best general of his time, Rommel probably the best general of modern history.
Rommel as a general was incredibly versatile, an all around innovator of tactics and warfare: He won skirmishes in the Alps in WWI, he won desert battles in WWII and he commanded the Ghost Division, a dreadful tank corp.
Politically speaking, I know Rommel advised nicely during WWII, hadn't Hitler been an idiot, history would have probably gone differently.
Napoleone on the other hand, conquered the whole europe, was the best tactitian of his time, but could not see the limits of his aggressive politics and thus created his own demise on the long run. As a general unparalleled at the time, but as an emperor he lacked the capability to reach a compromise for stability, he tried to break Europe into his view, but was broken in the process.
I'd say Rommel has a tiny tiny tiny tiny edge over Napoleone as a commander, but on every other aspect probably Napoleone bests him. I only wonder how far would have Napoleone gone with the right men to advise him in the times of need.