M3027 and LaserJet Pro M102a share specifications such as Print Technology (Laser), USB (Yes), Product Brand (HP), Maximum Paper Size (Legal).
The main differences: Printer Functions (M3027: Print; Scan; Copy, LaserJet Pro M102a: Print); Black Print Speed A4 (M3027: 25 ppm, LaserJet Pro M102a: 22 ppm); Print Resolution (M3027: 1200 x 1200 dpi, LaserJet Pro M102a: 600 x 600 dpi).
M3027 may suit users who need its differing values, while LaserJet Pro M102a benefits those who need its paired strengths. Review the specs table above before deciding.