Actually, the best one among them is the S8 MaxV Ultra :) but in terms of price, it is sold at a significantly higher price by our local sellers. However, I can list the reasons why I would choose the Q Revo MaxV between these two friends (I mean S8 Pro Ultra and Q Revo MaxV): More powerful suction with 7000pa Rotating, movable, and edge mops with active mopping features Quieter operation and lower power consumption (though these are minor differences, of course) Having an AI-enabled camera, although its security is questionable For now, we are satisfied with the device. It consumes clean water very quickly during deep cleaning, which is a bit annoying. I attribute this to our psychological tendency to overuse the product. I believe we can make water consumption more efficient with more effective settings, in time. The device is still very new to us, so I hope to share a more detailed review in the future.