The Brother MFC-L2820DW is a mono laser using toner; the Xerox B235 is a mono laser using toner. A black page costs 3.3¢ on one and 3.6¢ on the other. Over 5,000 pages the Brother MFC-L2820DW works out about $46 cheaper to have owned.
Cost to own · 5,000 pages
Brother MFC-L2820DW~$433
~$269 printer + ~$164 supplies
Xerox B235~$479
~$299 printer + ~$180 supplies
purchase priceink or toner. An estimate: purchase price plus 5,000 pages at each printer’s computed cost per page, assuming 4 mono pages for every colour page. Printers whose consumable price we could not source are left out.
Where the money goes
Brother MFC-L2820DW
~$269 to buy · ~$433 after 5,000 pages
Xerox B235
~$299 to buy · ~$479 after 5,000 pages
Estimates computed from published ISO page yields and consumable list prices.