KingD19
Shai-Gen's Enigmatic Wong
Palpatine is still considered one of the greatest Sith Lords ever. Up there with the likes of Darth Revan, Darth Bane, Emperor Vitiate, and Darth Krayt.
For years his Force Influence in the Dark Side was so all encompassing that Yoda and Windu, without a doubt the most powerful Jedi of the time were unable to see any move he made. And if you want to talk about powerful, he could create Force Hyperstorms in space so powerful they decimated entire fleets in moments. Fleets full of Star Destroyer class vessels.
Nobody came close to figuring out the entire clone army was his idea. No one even suspected.
His control over Anakin from the moment he became his mentor of sorts was so complete, that even when Anakin knew how bad he'd messed up in following him, he continued to do it out of fear and shame because Palpatine had left no way for him to redeem himself. It took the near death of his son to break his hold on Vader.
He engineered the entire Republic/Seperatist War so he could set up that moment when all the Jedi were vulnerable. He waited years so they had absolute trust in their clone troops and would never think they'd be betrayed. And then he cut them down. He even had the leaders of the Seperatists, people who were completely loyal to him, killed by Anakin because they were aliens(he hates aliens) and he didn't want any threats.
He thought of everything, which is why he ruled for so long. He even came back several times after his death at the hands of Vader.
He's a literal galaxy wide threat, while Voldemort threatened a country. That's a biiig difference, and Palpatine was a lot more cunning than Voldemort, who just got a big following because he was strong and their were racists in the wizard community who thought his ways were the right ways. He was brute strength to Palpatine's Cunning. And it's obvious who did better. Voldemort never ruled anything, people were scared of him, so what? Palpatine ruled the entire Galaxy for decades and had the entire galaxy in fear, especially every race that wasn't human or some form of really similar humanoid.