Yes, they are very different indeed....
I can see where you would say Mace would have won if not for Anakin's interference, but for me I still think Sidious had him from the very beginning. I mean, half of the fight he had his blade at Mace's chest, and then they'd cross blades, and he would have it angled for him again....his style is alot different than most Jedi/Sith, even though it is still From 5, its a strange variation that uses stabs and wide-strokes. Up until Mace got smart and disarmed him, it seemed like Sidious had the upper hand.
That, and the whole thing with the lightning. We obviously knew that Sidious wasn't weak enough to continue the blast, seeing as he did it twos econds after with about four times the enthusiam. The whole reason why he stopped the lightning was to bait Anakin into believing that Mace really was a cold-hearted killer, ready to strike down the Supreme Chancellor. Then, when Anakin took his arm, and inadvertently taken his final step to the Dark Side, Sidious could attack and make it look like self-defense, completely innocent.
Of course I could be wrong, I was just stating my opinion.
And, if it jsut me or is it weird that Tyranus never used some Force Lightning in the Obi-Wan/Anakin duel? You think it would have helped him out or something, hah. He still was pretty badass in that fight, though...so Im cool.