M4349 and imageCLASS MF249dw share specifications such as Printer Functions (Print, Scan, Copy, Fax), Print Technology (Laser), Automatic Duplex Printing (Yes), USB (Yes).
The main differences: Black Print Speed A4 (M4349: 43 ppm, imageCLASS MF249dw: 28 ppm); Print Resolution (M4349: 1200 x 1200 dpi, imageCLASS MF249dw: 600 x 600 dpi).
M4349 may suit users who need its differing values, while imageCLASS MF249dw benefits those who need its paired strengths. Review the specs table above before deciding.