A red light therapy panel and a full-body mat can both support red and near-infrared light routines, but they create very different user experiences. A panel is generally a rigid LED device used while standing or sitting at a stated distance, while a full-body mat is a flexible, close-fitting format designed for lying-down or reclining sessions.
The better choice is not simply the one with more LEDs, a higher wattage number, or a larger product size. The right format depends on your treatment area, available space, preferred body position, daily schedule, and the routine you are most likely to maintain.