When it comes to comparing two types of the same appliance, such as robot vacuums vs cordless vacuums, a big part of what makes one better than the other often has more to do with the end user and their needs than whether one is empirically better. Otherwise, one category of vacuum would dominate and the other would disappear.
The best robot vacuums and the best cordless vacuums both have their place in the world. However, one is probably a better fit for you than the other as they excel in different areas and either make vacuuming more convenient or offer a deeper clean.
