Premium Mattress Topper vs 3 Gel-Infused Memory Foam Mattress Topper with Washable Cover: which is safer?

Where these two actually differ

• We flag Volatile Organic Compounds (VOC) off-gassing from polyurethane foam, Polyester cover degradation and microfiber shedding, Polyurethane foam degradation and chemical leaching with age and Water-resistant coating composition (undisclosed) on the Helix and not on the Sleepyhead.
• We flag Volatile organic compounds (VOCs) from polyurethane foam off-gassing, Flame retardant chemical disclosure and identity, Formaldehyde in polyester cover or binder resins and Thermal decomposition if heated or exposed to high temperatures on the Sleepyhead and not on the Helix.
• The Helix is polyurethane foam, polyester cover where the Sleepyhead is Polyurethane memory foam + polyester cover, which is most of the difference in these two grades.
• These two are level, close enough that price and fit should decide it rather than our grade.