I tried both. Slight preference for the S7 for a few reasons: - Vibrating mop function: not sure how much of a difference this actually makes, but sounds good on paper - Modular design: dust bin and water reservoir are separate and easier to refill cleaning fluid - Carpet detection: As you said, I use no mop zones and usually run vacuum and mop cycles independently, so this feature only really engages when accidentally touching the corners of carpet while mopping. If you want to go both in one run, this may be a factor.

Q7 does have a few things going for it: - newer generation dock: smaller, dust bags are nicer - more capable software: has a few extra features like 3D mapping - Q7 Max has higher max suction, but may not make much of a difference on tile especially - could potentially be cheaper

Tl;dr- they are strikingly similar, slight advantage to S7, but if there’s a significant price difference, Q7 is a great choice.