Helio Smart Ring Health Tracker vs Smartwatch Silicone Watch Band - Flexible & Durable Strap Black Rainbow / 22mm: 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 OnePlus.
• We flag Pigment or colorant toxicity (black dye, rainbow print) and Allergen or irritant skin response on the OnePlus and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the OnePlus is Silicone elastomer, no surface treatment specified, 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 72%, because it discloses less.