Omega X Swatch Mission To Moon Quartz vs Smartwatch Withings Steel HR Sport: which is safer?

Where these two actually differ

• We flag Resin band VOC off-gassing, Resin band degradation over time and Nickel leaching from stainless steel case on the Swatch and not on the Withings.
• We flag Polymer gasket leaching (phthalates, BPA), Stainless steel leaching (nickel), Bacterial growth in water-resistant seals and Silicone or rubber band additives (if interchangeable band used) on the Withings and not on the Swatch.
• The Swatch is Quartz crystal, stainless steel case, resin band where the Withings is Stainless steel case, possibly water-resistant polymer gaskets, 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.
• We are less certain about the Withings grade, at 45% confidence against 78%, because it discloses less.