Helio Smart Ring Health Tracker vs Sleek Silicone Band with Brown-Black Buckle: 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 Suunto.
• We flag Nickel leaching (metal buckle), Azo dyes and colorant stability and Corrosion byproducts from buckle degradation on the Suunto and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the Suunto is silicone band, metal buckle, 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.