HL-5150D and LaserJet Pro M203dn share specifications such as Printer Functions (Print), Print Technology (Laser), Automatic Duplex Printing (Yes), USB (Yes).
The main differences: Black Print Speed A4 (HL-5150D: 20 ppm, LaserJet Pro M203dn: 28 ppm); Print Resolution (HL-5150D: 2400 x 600 dpi, LaserJet Pro M203dn: 600 x 600 dpi).
HL-5150D may suit users who need its differing values, while LaserJet Pro M203dn benefits those who need its paired strengths. Review the specs table above before deciding.