The NEMO Switchback Ultralight Sleeping Pad, Regular is the better default because it keeps the same 72-by-20-inch Regular footprint, 2 R-Value, and 20-by-5-by-5.5-inch packed size as the Therm-a-Rest while listing 0.9 inch of thickness. NEMO also describes its dual-density Axiotomic foam, hexagonal nodes, Hypnoelastic zones, and metallized thermal film. The advantage is not enormous, which is exactly why it is useful: it gives the everyday buyer a slightly thicker published profile without changing the familiar folding-foam routine.
The Therm-a-Rest Z Lite SOL Sleeping Pad, Regular has a real reason to win for the right packer. Therm-a-Rest lists a 14-ounce Regular pad, 0.75-inch thickness, the same 72-by-20-inch dimensions, the same R-Value of 2, and the same 20-by-5-by-5.5-inch packed dimensions. It combines softer foam on top, denser foam on the bottom, heat-trapping dimples, and a ThermaCapture surface. Pick it when that half-ounce difference and its long-established folded-panel format are what you want. For most people starting from a blank slate, the Switchback’s added listed thickness makes the clearer all-purpose choice.