The NeoAir XLite NXT outperforms on weight and warmth with a 4.5 R-value versus 3.2, making it the stronger choice for backpackers per OutdoorGearLab tests. The Ether Light XT provides superior cushioning at 10 cm thick but adds 100 g and limits cold-weather use. This is a close call for car campers but the NXT pulls ahead for serious backcountry trips.