I'm thinking Napoleon here, but it is all subjective anyway. Another good one is Richard the Lionhearted, who I was just reading about. Interestingly enough, a lot of the best military tacticians are terrible rulers and vice versa, as the case is with him. (Another example is George Washington–terrible general, great president).

Oh, yeah–another I just thought of is Vlad Dracula. But, I'm still sticking with Napoleon.

I'd pick genghis. Goat herders to world domination in a couple of generations, that was quite an achievement.

Another great one was Emperor Maurice, author of the Byzantine Empire's book on strategy, the Strategicon. And Gabriel Dumont, a native-Canadian who won consistently against greater odds vs. Brits.

Hannibal, his tactics are still taught in military schools today.
He attacked Italy and he defeated all Roman legions/armies sent to destroy him. He and his army stayed in Italy for 17 years and never lost a battle.

The eight that you have named are probably the best in history apart for Julius Caesar.
Also different eras each create different challenges
For me it would be Wellington with Hannibal Barca running a close second
Wellington because as the only defeat was suffered in the siege of Seringapatam in 1799 when he was the young colonel of the 33rd foot, just 29 years old. He defeated every marshall Napoleon threw at him and in the end got the emperor himself, the tactic of using the reverse slope to shield from artillery when all others faced it. simple but genius

My pick is somewhat unconventional and will not doubt draw criticism but here it is anyway: Gen. Robert E. Lee. I love military history and, from what I've read and heard about Lee's tactics, he has always impressed me. With an outnumbered army and very limited resources, he defeated his rivals in numerous battles. His reputation grew as a man who almost seemed to know his opponents' actions in advance and always adjusted accordingly, making brilliant assessments that usually baffled the opposing commanders.

Of those you mention it's a toss up between Hannibal and Scipio, I'd give the edge to Hannibal…tactician good, strategy, not so much.

Napoleon Bonaparte must be a great tactician. His warfare methods have been derived (more or less) from Sun Tzu's Art of War. He incorporated many elements such as calculation, speed, surprise and geography in his battle strategies.