It is not easy to define suction power. However, what I can say from my own experience: There are 3 suction strengths that you can set. The same applies to the water flow rate when scrubbing (which it does at the same time, if desired). It might help to have a look at the "Vacuum Wars" channel on YouTube to compare different test results.

I am very happy with the results in each case, but what I like most is the time saved! Would buy the device again at any time (the app is also very well made).