This is a hard one, because there are so many underated military commaders Ive studied, so if it's favorite, and not best, Ill have to say:
Sir William Howe (American Revolution)-Never really wanted to fight against the Americans and wrongly blamed for the British defeat. He was cautiouse, but not overly, and very human in the way he conducted war.
George Patton (WWI and WWII)-Who doesnt like this guy?
William T Sherman (US Civil War)-The undisputed rulur of "Total War"
Im actually not a big fan of Tommy Franks, I think he's a good guy, but seriously think it was his mistaks that botched the capture of bin laden and Operations Anaconda.