Helio Smart Ring Health Tracker vs Silicone Sport Watch Band Black Unisex Strap Amber Yellow / 20mm: which is safer?

Where these two actually differ

• We flag Polymer band composition and residual monomers and Bacterial growth in sealed band-case junction on the Amazfit and not on the Polar.
• We flag Bacterial or fungal growth in contact zone, Contact dermatitis or skin sensitization and Discoloration or surface breakdown with UV or sweat exposure on the Polar and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the Polar is silicone elastomer, 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 Amazfit grade, at 35% confidence against 78%, because it discloses less.