Verity Sense Optical Heart Rate Sensor vs Classic Plus Stainless Steel Magnetic Closure WatchBand for Apple Watch: which is safer?

Where these two actually differ

• We flag Optical window polymer clarity degradation and Microplastics or particle shedding from seal wear on the Polar and not on the X-Doria.
• We flag Nickel leaching from stainless steel on the X-Doria and not on the Polar.
• The Polar is Optical sensor, proprietary polymers where the X-Doria is Stainless steel, magnetic closure, 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 Polar grade, at 35% confidence against 82%, because it discloses less.