Robot vacuum vs robot mop and whether a combo is the answer.
Almost every robot vacuum sold today also mops. That has made the choice harder rather than easier, because a machine that does both does neither quite as well as a machine built for one.
The useful question is not which is better but which problem you actually have. Dust and pet hair are a vacuum problem. Sticky kitchen floors are a mop problem. They need different things from the hardware.
Deebot X8 Pro Omni
Best mopping of the combo machines
Roller mop systems that wash and extract while they work handle wet soil far better than a flat pad dragged across the floor. If mopping is genuinely why you are buying, this is the mechanism to look for.
Q8 Max+
If vacuuming is the real job
When mopping is a nice-to-have rather than the reason for the purchase, buying a strong vacuum with basic mopping saves a lot of money over a flagship combo you will mostly use dry.
What robot mopping actually does
A robot mop is very good at keeping an already-clean floor clean. Running daily, it stops dust turning into grime and that is a genuine benefit most owners underrate.
It is poor at removing anything dried on. There is no scrubbing pressure comparable to a person leaning on a mop, and a flat damp pad pushed across dried juice will mostly move it around.
The pad problem, and what solves it
The weakness of cheap combo robots is that the same pad covers the whole floor. By the last room it is carrying the dirt from the first. Machines that wash the pad mid-run, or use a roller that continuously extracts dirty water, avoid this entirely.
That single difference matters more than suction figures or app features when judging mopping quality. If the pad never gets cleaned during the run, treat the mopping as light maintenance rather than real cleaning.
Carpet is where combos get awkward
Any home with both carpet and hard floor needs the robot to deal with a wet pad near carpet. Solutions range from lifting the pad slightly, to detaching it at the dock, to simply avoiding carpeted rooms when mopping.
Pad lifting is the common approach and it works for low-pile carpet. For thick rugs, a machine that leaves the pad at the dock is the safer design. Check which one you are buying before assuming the problem is solved.