The LG C4 OLED 42 edges ahead with 144 Hz refresh and brighter HDR (per RTINGS and Notebookcheck), making it superior for gaming despite the size difference. The LG B4 OLED 77 wins on immersion and value for movie-focused buyers needing scale. C4 beats the B4 on motion handling by 24 Hz but trails on screen size by 35 inches.