The Dreame X50 Ultra's extendable brush catches what others miss

Both the Dreame X50 Ultra and the Roborock 798 use LiDAR for rock-solid navigation and mapping — neither is getting lost under your couch. The real difference comes down to the X50 Ultra’s extendable side brush that reaches into corners and along skirting boards automatically. The 798 navigates just as accurately, but that edge-reaching trick means the Dreame cleans more of the room on every pass without the bump-and-adjust dance.