Rituals are the Sith's only chance. In an actual fight, the only way you side with them is if you think numbers mean practically nothing, but even in that case we know that Palpatine and Plagueis didn't think they'd stand a chance against the Jedi Order as of the Plagueis novel (despite thinking they were each stronger than any individual member, they emphasized the numbers and not Yoda), and thinking numbers mean almost nothing should also lead you to think that Palpatine + Plagueis > the other Banite Sith.