Helio Smart Ring Health Tracker vs Mykomi Waterproof Bands for Fitbit Versa 3 / Fitbit Versa 4 / Fitbit Sense: 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 Fitbit.
• We flag Silicone degradation over time and Bacterial or fungal colonization on the Fitbit and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the Fitbit 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.