Comparative Test: HP Officejet Pro 8500 vs.Samsung CLX-3175FW: Features: Paper Tray
Since an AIO is utilized for faxing, printing, and scanning, paper consumption is proportionately higher than with a stand-alone-printer. For this reason AIOs in this price- and speed-range should have sufficient paper available. And an optional second paper tray would be a nice treat.
HPs Officejet can store 250 sheets, an additional paper tray for another 250 sheets is an option.
If you decide for Samsung, 150 sheets are the limit, an upgrade is not possible.