Helio Smart Ring Health Tracker vs Quest & M Series Rubber Strap: 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 Azo dyes or heavy metal pigments, Allergic contact dermatitis from accelerators or antioxidants, Strap degradation and microparticle shedding and Adhesive or glue off-gassing from attachment points on the Suunto and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the Suunto is Rubber (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 72%, because it discloses less.