AMBITHERM is our pick here, purely based on value. For a relatively small increase in price, you get a range of benefits and features not present on the SereneLife Portable Infrared Sauna. AMBITHERM’s design includes 50% more depth than standard models, allowing you to recline comfortably instead of sitting upright. Additional features such as a wooden reclining chair, a washable microfiber towel, and an entertainment pocket for devices enhance the overall experience. AMBITHERM also uses triple-layer carbon fibre panels with nanotechnology for even heat distribution and meets USA electrical safety standards, offering added reassurance. 

In comparison, the SereneLife Portable Infrared Sauna, covers the essentials of infrared therapy but without some of the extra comforts found in AMBITHERM. It lacks the size, a reclining chair, an entertainment pocket, and safety certifications, which may make it a less appealing option if you want added functionality. For those already at the top of their budget, SereneLife remains an option, though it doesn’t quite match AMBITHERM’s comfort and features.