The LG C4 55 OLED TV wins for dark-room viewing with infinite contrast measured at 0 nits black level on RTINGS. The Samsung QN90D 65 Neo QLED TV pulls ahead in bright rooms with 2000+ nits peak per Samsung lab data and better anti-reflection. Size difference means the QN90D delivers 40% more screen area but the LG C4 excels in cinematic accuracy per Wirecutter 2024 review.