The Pro Ultra station cleans the device as it moves around. However, you then have to clean the docking station regularly, which is more tedious. With the S8+, all you have to do is rinse the micro-fibre, which takes a minute.... Ideally, you should buy some extra to rotate with the washing machine, but not for every cleaning.

Yes, only the station is different!
Happy Easter, Miro

I have the S8+. My pre-purchase analysis showed that the robots themselves are practically identical. I let the s8+ vacuum twice a week (time programme) and change the cleaning cloth and fill the water tank beforehand. It only takes 2 minutes per week and the addition of the pro is not necessary. but the suction station is very practical. I am extremely satisfied

No. The robots themselves are also different. Among other things, the S8 Pro Ultra has a Vibrarise 2.0 mopping system with two oscillating modules.

The station is different.
With the all-in-one dock, the robot cleans itself after every clean.
Has improved VibraRise® 2.0 in two ways with an additional vibration module