Greatest Sith empire?

What was the most successful, most influential and most powerful Sith empire? Was the ancient first sith empire under the mighty dark lord marka ragnos and his successor naga sadow in the time of the great hyperspace war? Or the 2nd new sith empire with Darth malgus and the dark council? What about Krayts 'one sith'? Nihilus, traya and sions sith triumvirate? Exar kuns empire? Darth banes? The galactic empire? Revans and maleks sith? The list goes on! Etc...lol.