Ease of use, single pass dual scan and smaller footprint.
Most paper docs are double sided.
At the moment, I am using a Fuji Xerox M225dw. It serves the purpose but is single side.
I have to do double side manually. The speed is not fantastic.
I can start the scan and go do something else.
I want something that waits for me rather than I wait for it.
The dilemma now is that I prefer one that scan direct to USB Flash Drive so I can do without the PC - I can bring it elsewhere. I have explored the IX1600 and find it has a lot of good features except the scan to USB Flash Drive.