Best brushing robot?

Is there one robot that brushes the best? I have a 20x40 pool with pebble sheen surface, but it's a typical screened in florida pool so I do not have issues with leaves and heavy debris. I would like a robot that could help me with brushing the pool. I've had an aquabot X4 robot for the past 5 years. It has only one "brush" which does very little that I can see. The X4 is excellent at filtering and picking up debris in the pool, but very poor at actually brushing.

Do any of the robots actually brush the pool?
 
The M series robot seem to have more “active“ brushes.

I know one of the reasons I like my M500 is the extra 3rd center brush. I would not buy it again because of the two basket design.

I think if money is no object the best brushing robot out there would be the M600
 
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