I am unsure which product would be better and exactly what the difference are in plain terms now……….
Is one an older brand?
From my understanding there is a:
iRobot Roomba 4210 Bagless Robotic Vacuum
Product Information
Roomba Discovery is leading the way into the next generation of Roombas. With more advancements and improvements, Roomba Discovery features dirt detect, a self-charging Home Base(TM) and an Advanced Power System that makes this the finest robotic floorvac on the planet. And theres still a lot of planet left to clean.
Key Feature
Design Robotic
Dirt Capture Container
Filtration
Filtration Levels 3
Convenience
Features Cordless (Rechargable), Edge Cleaning, Rotating brushes
Color Gray
Miscellaneous
Weight 14 lb.
Please look at the details for the information on the other one – I don’t believe there is any more irobots offered besides the scooba
The second one which I am aware of is:
iRobot Roomba Discovery SE Bagless Robotic Vacuum
Product Information
Roomba Discovery SE is the top of the line Roomba with some very down to earth features. Like Roomba Discovery, the SE features Dirt Detect, the self-charging Home Base(TM), an extra-large debris bin, the Roomba Remote, three cleaning modes plus a Charging Wall Mount for convenient storage. And, of course, the SE comes with the Advanced Power System that gives all Roombas the energy to get the job done.
Product MPN
MPN Roomba4220
Key Feature
Design Robotic
Dirt Capture Container
Tank / Bag Capacity 0.13 Gallon
Filtration
Filtration Levels 2
Convenience
Features Cordless (Rechargable), Dirt Indicator, Edge Cleaning, Rotating brushes
Color Gray
Miscellaneous
Weight 7.5 lb.
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If it helps I have hard floor with a few rugs.