Helio Smart Ring Health Tracker vs Women's Ring Watch: 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 Fossil.
• We flag Synthetic strap off-gassing and plasticizer leaching, Leather strap contamination (if genuine leather) and Nickel release from stainless steel case or buckle on the Fossil and not on the Amazfit.
• The Amazfit is Titanium alloy case, polymer band where the Fossil is Stainless steel case, mineral crystal, leather/synthetic strap, 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.