HL-3260N and MFC-L5900DW share specifications such as Print Technology (Laser), Ethernet (Yes), Product Brand (Brother).
The main differences: Printer Functions (HL-3260N: Print, MFC-L5900DW: Print, Scan, Copy, Fax); Black Print Speed A4 (HL-3260N: 32 ppm, MFC-L5900DW: 42 ppm); Print Resolution (HL-3260N: 600 x 600 dpi, MFC-L5900DW: 1200 x 1200 dpi).
HL-3260N may suit users who need its differing values, while MFC-L5900DW benefits those who need its paired strengths. Review the specs table above before deciding.