The Roomba 705 Max and Combo 4020 handle pet hair equally well

Sometimes the answer is genuinely boring: both the Roomba 705 Max and Combo 4020 use the same dual rubber brush system, and both pull pet hair from medium-pile carpets equally well. No winner, no surprise — just two machines with the same core cleaning engine doing the same job.

The dual rubber brush design is what makes the difference here. Unlike bristle brushes that wrap up in long hair and require regular detangling, rubber rollers just keep spinning, and pet hair gets sucked straight into the bin. If you’re choosing between these two, let other features — mopping, dock type, price — decide it for you. On pet hair specifically, it’s a tie.