Mine would have to be Ceaser,
He always fought at front with his men, was often hugely outnumbered both in Gaul, the Civil war and other wars, but always came through.
His life changed so much and his victories spanned several decades. He always out thought the enemy, would often even pick ground unfavourable to himself, to give opponents a sense of security.
He was also truly brilliant at planning, and the strategic overview. Logistics is as much a part of winning as the battle itself and he was a master at both. Everything you read abut him, no detail was too small, he had the common touch [why most Roman Nobility hated him] he was supremely good in not just one area of warfare, but every area, he also when needed would take chances!
I think its hard to find any commander that in total terms, was as rounded in every area of warfare as Ceaser, also, one who had such a profound effect on the world, then and now. Gauis Marius was another good General, so was Sulla from Roman times, but in overall terms, from any era, I can't think of anyone that really comes close to Ceaser.