The debate between the Boeing 787 Dreamliner and the Boeing 777 usually boils down to "technology versus space." In 2026, most travelers find the 787 Dreamliner more comfortable for the "body" because it features a lower cabin altitude (6,000 ft vs 8,000 ft) and higher humidity levels, which significantly reduces jet lag, dry eyes, and headaches. The 787 also has larger, dimmable windows and a quieter ride due to advanced engine chevrons. However, the Boeing 777 (especially the 777-300ER and the new 777X) is often preferred for "elbow room." The 777 has a wider cabin cross-section, which usually allows for slightly wider seats in Economy, especially compared to the 787's 3-3-3 layout which many find "cramped" at the shoulders. If you are a window lover who wants to arrive feeling fresh, the 787 is the winner. If you are a larger person who values every centimeter of seat width, the 777 remains the "king of the skies" for long-haul comfort, provided the airline hasn't squeezed in an extra seat per row.