The LG C5 OLED 77 wins decisively with perfect blacks and 120 Hz refresh per RTINGS testing versus the Hisense A6's 300 nits LED limitations. It also leads in features like Dolby Vision gaming support and WebOS apps. The Hisense A6 remains viable only for strict budget 55-inch setups but trails significantly in picture quality metrics from CNET and Consumer Reports comparisons.