The problem with this discussion, is it really is apples and oranges. How do you compare Douglas Macarthur - brilliant WW II pacific conqueror with all the resources of a smashed ULTRA (Nimitz as well) with Hannibal - who had elephants, but no battleships, or intercepted and decrypted enemy movement ciphers? We could base this on degree of success, in which case someone like Nelson (yes, i know - Navy puke) appears to be a lead candidate whereas someone like Stormin’ Norman and Tommy Franks - although American heroes - simply took a ton of intel, and vast technological and military superiority and applied that to what nearly amounts to mass murder of Iraqi soldiers (don’t get me wrong - it was well that we went in the first time).
Anyway, you get my point. Maybe it would be more appropriate to compare “Civil” war Generals (Grant, Forrest, Lee, Jackson et al.), WW II field marshalls/Generals (Rommell, Montgommery, Patton, MacArthur, Simmonds (Canadian general who got screwed by Monty’s “market garden”), Eisenhower, etc. Another category might be “generals of antiquity”, “generals of the Renaissance era” - you get my meaning.